java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.eclipse.jdt.ui.JavaElementImageDescriptor.hashCode(JavaElementImageDescriptor.java:207)
at java.util.HashMap.hash(Unknown Source)
at java.util.HashMap.get(Unknown Source)
at org.eclipse.jdt.internal.ui.viewsupport.ImageDescriptorRegistry.get(ImageDescriptorRegistry.java:57)
at org.eclipse.jdt.internal.ui.viewsupport.JavaElementImageProvider.getImageLabel(JavaElementImageProvider.java:104)
at org.eclipse.jdt.internal.ui.viewsupport.JavaElementImageProvider.getImageLabel(JavaElementImageProvider.java:98)
at org.eclipse.jdt.internal.ui.viewsupport.JavaUILabelProvider.getImage(JavaUILabelProvider.java:142)
at org.eclipse.jdt.internal.ui.packageview.PackageExplorerLabelProvider.getImage(PackageExplorerLabelProvider.java:137)
at org.eclipse.ui.internal.navigator.NavigatorContentServiceLabelProvider.findImage(NavigatorContentServiceLabelProvider.java:199)
at org.eclipse.ui.internal.navigator.NavigatorContentServiceLabelProvider.getColumnImage(NavigatorContentServiceLabelProvider.java:107)
at org.eclipse.ui.internal.navigator.NavigatorContentServiceLabelProvider.getImage(NavigatorContentServiceLabelProvider.java:99)
at org.eclipse.jface.viewers.DelegatingStyledCellLabelProvider.getImage(DelegatingStyledCellLabelProvider.java:195)
at org.eclipse.jface.viewers.DecoratingStyledCellLabelProvider.getImage(DecoratingStyledCellLabelProvider.java:168)
at org.eclipse.jface.viewers.DelegatingStyledCellLabelProvider.update(DelegatingStyledCellLabelProvider.java:121)
at org.eclipse.jface.viewers.DecoratingStyledCellLabelProvider.update(DecoratingStyledCellLabelProvider.java:131)
at org.eclipse.jface.viewers.ViewerColumn.refresh(ViewerColumn.java:141)
at org.eclipse.jface.viewers.AbstractTreeViewer.doUpdateItem(AbstractTreeViewer.java:949)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:173)
at org.eclipse.ui.internal.navigator.resources.ResourceToItemsMapper.updateItem(ResourceToItemsMapper.java:150)
at org.eclipse.ui.internal.navigator.resources.ResourceToItemsMapper.objectChanged(ResourceToItemsMapper.java:138)
at org.eclipse.jface.viewers.ContentViewer$1.labelProviderChanged(ContentViewer.java:99)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:173)
at org.eclipse.jface.viewers.BaseLabelProvider.fireLabelProviderChanged(BaseLabelProvider.java:69)
at org.eclipse.jface.viewers.DecoratingStyledCellLabelProvider.lambda$0(DecoratingStyledCellLabelProvider.java:75)
at org.eclipse.ui.internal.decorators.DecoratorManager.fireListener(DecoratorManager.java:371)
at org.eclipse.ui.internal.decorators.DecorationScheduler$3.runInUIThread(DecorationScheduler.java:511)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:182)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388)
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:673)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:610)

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