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Failed to execute runnable (java.lang.NullPointerException)
org.eclipse.core.runtime.AssertionFailedException: assertion failed: 	at org.eclipse.core.runtime.Assert.isTrue(Assert.java:110)	at org.eclipse.core.runtime.Assert.isTrue(Assert.java:96)	at org.eclipse.jface.text.source.AnnotationModel.getRegionAnnotationIterator(AnnotationModel.java:741)	at org.eclipse.jface.text.source.AnnotationModel.getAnnotationIterator(AnnotationModel.java:699)	at org.eclipse.jface.text.source.AnnotationRulerColumn.doPaint1(AnnotationRulerColumn.java:727)	at org.eclipse.jface.text.source.AnnotationRulerColumn.doubleBufferPaint(AnnotationRulerColumn.java:541)	at org.eclipse.jface.text.source.AnnotationRulerColumn.redraw(AnnotationRulerColumn.java:824)	at org.eclipse.jface.text.source.AnnotationRulerColumn$6.run(AnnotationRulerColumn.java:807)	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4041)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3660)	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640)	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)	at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)	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:369)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:619)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574)	at org.eclipse.equinox.launcher.Main.run(Main.java:1407)	at org.eclipse.equinox.launcher.Main.main(Main.java:1383)