org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.NullPointerException)

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Failed to execute runnable (java.lang.NullPointerException)
java.lang.NullPointerException:
at org.eclipse.ui.texteditor.AbstractDecoratedTextEditor.performSaveAs(AbstractDecoratedTextEditor.java:1580)
at org.eclipse.ui.texteditor.AbstractTextEditor.handleEditorInputChanged(AbstractTextEditor.java:4746)
at org.eclipse.ui.texteditor.StatusTextEditor.handleEditorInputChanged(StatusTextEditor.java:267)
at org.eclipse.ui.texteditor.AbstractDecoratedTextEditor.handleEditorInputChanged(AbstractDecoratedTextEditor.java:1502)
at org.eclipse.ui.texteditor.AbstractTextEditor.sanityCheckState(AbstractTextEditor.java:4905)
at org.eclipse.ui.texteditor.StatusTextEditor.sanityCheckState(StatusTextEditor.java:257)
at org.eclipse.ui.texteditor.AbstractTextEditor.safelySanityCheckState(AbstractTextEditor.java:4883)
at org.eclipse.ui.texteditor.AbstractTextEditor$ActivationListener.handleActivation(AbstractTextEditor.java:984)
at org.eclipse.ui.texteditor.AbstractTextEditor$ActivationListener.access$0(AbstractTextEditor.java:977)
at org.eclipse.ui.texteditor.AbstractTextEditor$10.run(AbstractTextEditor.java:1005)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4144)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:353)
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:629)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
at org.eclipse.equinox.launcher.Main.run(Main.java:1438)

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