org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.ClassCastException: org.eclipse.jst.j2ee.webapplication.internal.impl.WebAppImpl cannot be cast to org.eclipse.core.resources.IResource)

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via pydev by *anonymous
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Failed to execute runnable (java.lang.ClassCastException: org.eclipse.jst.j2ee.webapplication.internal.impl.WebAppImpl cannot be cast to org.eclipse.core.resources.IResource)
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Failed to execute runnable (java.lang.NullPointerException)
org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.ClassCastException: org.eclipse.jst.j2ee.webapplication.internal.impl.WebAppImpl cannot be cast to org.eclipse.core.resources.IResource)
at org.python.pydev.navigator.PythonModelProvider.wrapChildren(PythonModelProvider.java:327)
at org.python.pydev.navigator.PythonModelProvider.convertToPythonElementsAddOrRemove(PythonModelProvider.java:250)
at org.python.pydev.navigator.PythonModelProvider.interceptAdd(PythonModelProvider.java:106)
at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.interceptAdd(SafeDelegateTreeContentProvider.java:224)
at org.eclipse.ui.internal.navigator.NavigatorPipelineService.pipelineInterceptAdd(NavigatorPipelineService.java:124)
at org.eclipse.ui.internal.navigator.NavigatorPipelineService.interceptAdd(NavigatorPipelineService.java:81)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:123)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3659)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2389)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2353)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2219)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:508)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:447)

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