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Following the JavaFX IntelliJ modular with Gradle tutorial here, I downloaded the project from github and followed the instructions. When I do gradlew run, I get the error:

> Task :run FAILED Error occurred during initialization of boot layer java.lang.module.FindException: Error reading module: C:\Users\ANDREW-SL3\github\hellofx\build\classes\java\main Caused by: java.lang.module.InvalidModuleDescriptorException: Package hellofx.org.openjfx not found in module

Since I made no modification to the project I assume I've done something else wrong but can't figure out what it is.

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I have suffered the same problem. I think that it is related to a change in how latest Gradle versions (>= 6.4) treat modules. In my case this post helped me to solve it.

Basically, add this to your build.gradle file:

java { modularity.inferModulePath.set(true) } application { mainModule = 'hellofx' // name defined in module-info.java mainClass = 'org.openjfx.MainApp' } run { main = "$moduleName/org.openjfx.MainApp" }
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