WebView shows net::ERR_CLEARTEXT_NOT_PERMITTED on HTTPS url

I'm trying to load an url that fit security protocols with HTTPS, but when I'm trying to load on a WebView, android shows me net::ERR_CLEARTEXT_NOT_PERMITTED. Why? is a HTTPS what is the problem?

The source code that shows it is:

public class InternalWebBrowserActivityHelperImpl implements InternalWebBrowserActivityHelper, Constants { private final String TAG = getClass().getSimpleName(); @NonNull private InternalWebBrowserActivityView activityView; public InternalWebBrowserActivityHelperImpl(@NonNull InternalWebBrowserActivityView activityView){ this.activityView = activityView; } public WebChromeClient getWebChromeClient = new WebChromeClient() { @Override public void onProgressChanged(WebView view, int newProgress) { super.onProgressChanged(view, newProgress); } }; public WebViewClient getWebViewClient() { return new WebViewClient() { @Override public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) { super.onReceivedError(view, request, error); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { LoggerManager.handlesError("onReceivedError", request.getUrl().toString()); }else{ LoggerManager.handlesError("onReceivedError", error.toString()); } activityView.hideLoadingView(); activityView.showWebView(); } @Override public void onPageFinished(WebView view, String url) { super.onPageFinished(view, url); LoggerManager.handlesError("onPageFinished", url); activityView.hideLoadingView(); activityView.showWebView(); } @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { //activityView.showLoadingView(); LoggerManager.handlesError("override", url); return super.shouldOverrideUrlLoading(view, url); } }; } @Override public void setupHelper(String url) { //7activityView.showLoadingView(); activityView.showWebView(); WebSettings.ZoomDensity zoomDensity = WebSettings.ZoomDensity.FAR; activityView.getFullWebView().getSettings().setJavaScriptEnabled(true); activityView.getFullWebView().getSettings().setDomStorageEnabled(true); // Add this activityView.getFullWebView().getSettings().setDefaultZoom(zoomDensity); activityView.getFullWebView().getSettings().setSupportZoom(true); activityView.getFullWebView().getSettings().setBuiltInZoomControls(true); activityView.getFullWebView().requestFocus(View.FOCUS_DOWN); activityView.getFullWebView().setWebChromeClient(getWebChromeClient); activityView.getFullWebView().setWebViewClient(getWebViewClient()); activityView.getFullWebView().loadUrl(url); } } 

Thanks