"gulp serve" is returning workbench.html that i can not add the web part to

I have developed an SPFx web part with this details:-

yo-rc.json for the project, is:-

{ "@microsoft/generator-sharepoint": { "isCreatingSolution": true, "environment": "spo", "version": "1.12.1", "libraryName": "spfx-my-modal-popup", "libraryId": "616c9b54-d123-42d8-9942-9abb0fe4f46c", "packageManager": "npm", "isDomainIsolated": false, "componentType": "webpart" } } 

now i installed nvm to be able to run multiple node versions, here what i did so far:-

1- I install node version 10.24.1 , then i use it as follow :-

nvm use 10.24.1 

2- i run :-

gulp serve 

The https://localhost:4321/temp/workbench.html opened but when i tried to add the web part by clicking on the + icon i will get this error inside the F12 developer tool:-

here is the full error:-

[1636842661379][PropertyPaneLoader] [SPLoaderError.loadComponentError]: ***Failed to load component "f9e737b7-f0df-4597-ba8c-3060f82380db" (SPPropertyPane). Original error: ***Failed to load URL 'https://localhost:4321/node_modules/@microsoft/sp-property-pane/dist/dist/sp-property-pane_en-us.js' for resource 'sp-property-pane' in component 'f9e737b7-f0df-4597-ba8c-3060f82380db' (SPPropertyPane). The file was not found in the server. Make sure that you are running 'gulp serve'. ***INNERERROR: ***Failed to load URL 'https://localhost:4321/node_modules/@microsoft/sp-property-pane/dist/dist/sp-property-pane_en-us.js' for resource 'sp-property-pane' in component 'f9e737b7-f0df-4597-ba8c-3060f82380db' (SPPropertyPane). The file was not found in the server. Make sure that you are running 'gulp serve'. ***CALLSTACK: SPError@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:24443:24 SPLoaderError@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:42161:28 ff4n/ErrorBuilder</ErrorBuilder.buildErrorWithVerboseLog@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:46155:21 ff4n/ErrorBuilder</ErrorBuilder.buildLoadComponentError@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:46024:21 _loadComponentImpl/<@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45362:75 promise callback*_loadComponentImpl@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45361:8 _loadComponentRetryStrategy@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45299:12 _loadComponentRetryStrategy/<@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45309:20 promise callback*_loadComponentRetryStrategy@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45304:10 _loadComponentRetryStrategy/<@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45309:20 promise callback*_loadComponentRetryStrategy@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45304:10 loadComponent@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45281:55 ++S4/SPRequireJsComponentLoader</SPRequireJsComponentLoader.prototype._loadComponentWithExecutor@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:41771:85 td2X/LoadComponentExecutor</LoadComponentExecutor.prototype.loadComponent@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:46896:21 ++S4/SPRequireJsComponentLoader</SPRequireJsComponentLoader.prototype.loadComponent@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:41742:44 Uk6p/BaseComponentLoader</BaseComponentLoader.prototype.loadComponentById@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:44816:25 KZU3/SPComponentLoader</SPComponentLoader.loadComponentById@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:43438:44 get@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:110639:99 set@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:16957:21 set@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:14989:13 CanvasToolboxHint/_this._handleClick@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/chunk.sp-canvas-edit_7833b0118fe685da1388.js:3982:17 callCallback@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75432:14 invokeGuardedCallbackDev@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75482:16 invokeGuardedCallback@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75539:31 invokeGuardedCallbackAndCatchFirstError@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75553:25 executeDispatch@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75844:42 executeDispatchesInOrder@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75866:20 executeDispatchesAndRelease@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75963:29 executeDispatchesAndReleaseTopLevel@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75971:10 forEachAccumulated@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75945:8 runEventsInBatch@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:76099:21 runExtractedEventsInBatch@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:76107:19 handleTopLevel@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:80109:30 batchedUpdates$1@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:95687:12 batchedUpdates@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:77434:12 dispatchEvent@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:80188:19 interactiveUpdates$1/<@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:95738:14 unstable_runWithPriority@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:97248:12 interactiveUpdates$1@https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:95737:22 sp-webpart-workbench-assembly_default.js:26401:21 Uncaught (in promise) Error: ***Failed to load component "f9e737b7-f0df-4597-ba8c-3060f82380db" (SPPropertyPane). Original error: ***Failed to load URL 'https://localhost:4321/node_modules/@microsoft/sp-property-pane/dist/dist/sp-property-pane_en-us.js' for resource 'sp-property-pane' in component 'f9e737b7-f0df-4597-ba8c-3060f82380db' (SPPropertyPane). The file was not found in the server. Make sure that you are running 'gulp serve'. SPError https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:24443 SPLoaderError https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:42161 buildErrorWithVerboseLog https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:46155 buildLoadComponentError https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:46024 _loadComponentImpl https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45362 promise callback*_loadComponentImpl https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45361 _loadComponentRetryStrategy https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45299 _loadComponentRetryStrategy https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45309 promise callback*_loadComponentRetryStrategy https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45304 _loadComponentRetryStrategy https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45309 promise callback*_loadComponentRetryStrategy https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45304 loadComponent https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45281 loadComponent https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:46458 _loadComponentImpl https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:43631 promise callback*PypK/SystemJsFallbackLoader</SystemJsFallbackLoader.prototype._loadComponentImpl https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:43621 loadComponent https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:46896 loadComponent https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:43617 _loadComponentWithExecutor https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:41781 promise callback*++S4/SPRequireJsComponentLoader</SPRequireJsComponentLoader.prototype._loadComponentWithExecutor https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:41777 loadComponent https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:46896 loadComponent https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:41742 loadComponentById https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:44816 loadComponentById https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:43438 get https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:110639 set https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:16957 set https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:14989 _handleClick https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/chunk.sp-canvas-edit_7833b0118fe685da1388.js:3982 callCallback https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75432 invokeGuardedCallbackDev https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75482 invokeGuardedCallback https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75539 invokeGuardedCallbackAndCatchFirstError https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75553 executeDispatch https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75844 executeDispatchesInOrder https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75866 executeDispatchesAndRelease https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75963 executeDispatchesAndReleaseTopLevel https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75971 forEachAccumulated https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75945 runEventsInBatch https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:76099 runExtractedEventsInBatch https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:76107 handleTopLevel https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:80109 batchedUpdates$1 https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:95687 batchedUpdates https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:77434 dispatchEvent https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:80188 1 https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:95738 unstable_runWithPriority https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:97248 interactiveUpdates$1 https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:95737 interactiveUpdates https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:77453 dispatchInteractiveEvent https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:80165 sp-webpart-workbench-assembly_default.js:24430:28 Uncaught (in promise) Error: ***Failed to load component "f9e737b7-f0df-4597-ba8c-3060f82380db" (SPPropertyPane). Original error: ***Failed to load URL 'https://localhost:4321/node_modules/@microsoft/sp-property-pane/dist/dist/sp-property-pane_en-us.js' for resource 'sp-property-pane' in component 'f9e737b7-f0df-4597-ba8c-3060f82380db' (SPPropertyPane). The file was not found in the server. Make sure that you are running 'gulp serve'. SPError https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:24443 SPLoaderError https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:42161 buildErrorWithVerboseLog https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:46155 buildLoadComponentError https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:46024 _loadComponentImpl https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45362 promise callback*_loadComponentImpl https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45361 _loadComponentRetryStrategy https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45299 _loadComponentRetryStrategy https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45309 promise callback*_loadComponentRetryStrategy https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45304 _loadComponentRetryStrategy https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45309 promise callback*_loadComponentRetryStrategy https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45304 loadComponent https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:45281 _loadComponentWithExecutor https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:41771 loadComponent https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:46896 loadComponent https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:41742 loadComponentById https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:44816 loadComponentById https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:43438 get https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:110639 set https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:16957 set https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:14989 _handleClick https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/chunk.sp-canvas-edit_7833b0118fe685da1388.js:3982 callCallback https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75432 invokeGuardedCallbackDev https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75482 invokeGuardedCallback https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75539 invokeGuardedCallbackAndCatchFirstError https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75553 executeDispatch https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75844 executeDispatchesInOrder https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75866 executeDispatchesAndRelease https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75963 executeDispatchesAndReleaseTopLevel https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75971 forEachAccumulated https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:75945 runEventsInBatch https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:76099 runExtractedEventsInBatch https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:76107 handleTopLevel https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:80109 batchedUpdates$1 https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:95687 batchedUpdates https://localhost:4321/temp/workbench-packages/@microsoft_sp-webpart-workbench/local-workbench/sp-webpart-workbench-assembly_default.js:77434 dispatchEvent https://localhost:4321/temp/workbench-packages 

here is my MyModalPopupWebPart.ts:-

import * as React from 'react'; import * as ReactDom from 'react-dom'; import { Version } from '@microsoft/sp-core-library'; import { IPropertyPaneConfiguration, PropertyPaneTextField } from '@microsoft/sp-property-pane'; import { BaseClientSideWebPart } from '@microsoft/sp-webpart-base'; import * as strings from 'MyModalPopupWebPartStrings'; import MyModalPopup from './components/MyModalPopup'; import { IMyModalPopupProps } from './components/IMyModalPopupProps'; export interface IMyModalPopupWebPartProps { description: string; WhoWeAre: string; OurValue:string; } export default class MyModalPopupWebPart extends BaseClientSideWebPart<IMyModalPopupWebPartProps> { public render(): void { const element: React.ReactElement<IMyModalPopupProps> = React.createElement( MyModalPopup, { description: this.properties.description, WhoWeAre: this.properties.WhoWeAre, OurValue: this.properties.OurValue } ); ReactDom.render(element, this.domElement); } protected onDispose(): void { ReactDom.unmountComponentAtNode(this.domElement); } protected get dataVersion(): Version { return Version.parse('1.0'); } protected getPropertyPaneConfiguration(): IPropertyPaneConfiguration { return { pages: [ { header: { description: strings.PropertyPaneDescription }, groups: [ { groupName: strings.BasicGroupName, groupFields: [ PropertyPaneTextField('WhoWeAre', { label: "who We Are", multiline: true }), PropertyPaneTextField('OurValue', { label: "Our value", multiline: true }), PropertyPaneTextField('description', { label: "Description" }), ] } ] } ] }; } } 

here is my MYModal.tsx:-

import * as React from 'react'; import { useId, useBoolean } from '@fluentui/react-hooks'; import { sanitize } from 'dompurify'; import { getTheme, mergeStyleSets, FontWeights, Modal, IIconProps, IStackProps, } from '@fluentui/react'; import { IconButton, IButtonStyles } from '@fluentui/react/lib/Button'; export const MYModal = (myprops) => { const [isModalOpen, { setTrue: showModal, setFalse: hideModal }] = useBoolean(false); const [isPopup, setisPopup] = React.useState(true); const titleId = useId('title'); React.useEffect(() => { showModal(); }, [isPopup]); function ExitHandler() { hideModal(); setisPopup(current => !current) myprops.handler(); } return ( <div> <Modal titleAriaId={titleId} isOpen={isModalOpen} onDismiss={ExitHandler} isBlocking={true} containerClassName={contentStyles.container} > <div className={contentStyles.header}> <span id={titleId}>Modal Popup</span> <IconButton styles={iconButtonStyles} iconProps={cancelIcon} ariaLabel="Close popup modal" onClick={ExitHandler} /> </div> <div className={contentStyles.body}> <div dangerouslySetInnerHTML={{ __html: sanitize(myprops.WhoWeAre) }} /> </div> </Modal> </div> ); }; 

here is my MyModalPopup.tsx:-

import * as React from 'react'; import { IMyModalPopupProps } from './IMyModalPopupProps'; import { DefaultButton } from '@fluentui/react/lib/Button'; import { MYModal } from './MYModal'; import { MYModal2 } from './MYModal2'; interface IPopupState { showModal: string; } export default class MyModalPopup extends React.Component<IMyModalPopupProps, IPopupState> { constructor(props: IMyModalPopupProps, state: IPopupState) { super(props); this.state = { showModal: '' }; this.handler = this.handler.bind(this); this.Buttonclick = this.Buttonclick.bind(this); } handler() { this.setState({ showModal: '' }) } private Buttonclick(e, whichModal) { e.preventDefault(); this.setState({ showModal: whichModal }); } public render(): React.ReactElement<IMyModalPopupProps> { const { showModal } = this.state; return ( <div> <DefaultButton onClick={(e) => this.Buttonclick(e, 'our-value')} text="Our Value" /> { showModal === 'our-value' && <MYModal2 OurValue={this.props.OurValue} myprops={this.state} handler={this.handler} />} <DefaultButton onClick={(e) => this.Buttonclick(e, 'who-we-are')} text="Who We Are" /> { showModal === 'who-we-are' && <MYModal WhoWeAre={this.props.WhoWeAre} myprops={this.state} handler={this.handler} />} </div> ); } }