at org.eclipse.core.launcher.Main.main(Main.java:952)
org.eclipse.core.runtime.AssertionFailedException: null argument:
	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:84)
	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:72)
	at org.eclipse.core.commands.operations.AbstractOperation.hasContext(AbstractOperation.java:150)
	at org.eclipse.ui.operations.OperationHistoryActionHandler$HistoryListener.historyNotification(OperationHistoryActionHandler.java:127)
	at org.eclipse.core.commands.operations.DefaultOperationHistory.notifyListeners(DefaultOperationHistory.java:879)
	at org.eclipse.core.commands.operations.DefaultOperationHistory.notifyAdd(DefaultOperationHistory.java:931)
	at org.eclipse.core.commands.operations.DefaultOperationHistory.add(DefaultOperationHistory.java:188)
	at org.eclipse.text.undo.DocumentUndoManager.addToOperationHistory(DocumentUndoManager.java:960)
	at org.eclipse.text.undo.DocumentUndoManager.access$15(DocumentUndoManager.java:957)
	at org.eclipse.text.undo.DocumentUndoManager$DocumentListener.documentChanged(DocumentUndoManager.java:635)
	at org.eclipse.jface.text.AbstractDocument.doFireDocumentChanged2(AbstractDocument.java:699)
	at org.eclipse.jface.text.AbstractDocument.doFireDocumentChanged(AbstractDocument.java:672)
	at org.eclipse.jface.text.AbstractDocument.doFireDocumentChanged(AbstractDocument.java:657)
	at org.eclipse.jface.text.AbstractDocument.fireDocumentChanged(AbstractDocument.java:722)
	at org.eclipse.jface.text.AbstractDocument.replace(AbstractDocument.java:1080)
	at org.eclipse.jface.text.AbstractDocument.replace(AbstractDocument.java:1090)
	at org.eclipse.jface.text.DefaultDocumentAdapter.replaceTextRange(DefaultDocumentAdapter.java:243)
	at org.eclipse.swt.custom.StyledText.modifyContent(StyledText.java:5738)
	at org.eclipse.swt.custom.StyledText.sendKeyEvent(StyledText.java:6447)
	at org.eclipse.swt.custom.StyledText.doContent(StyledText.java:2094)
	at org.eclipse.swt.custom.StyledText.handleKey(StyledText.java:5024)
	at org.eclipse.swt.custom.StyledText.handleKeyDown(StyledText.java:5049)
	at org.eclipse.swt.custom.StyledText$7.handleEvent(StyledText.java:4789)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1085)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1109)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1094)
	at org.eclipse.swt.widgets.Widget.sendIMKeyEvent(Widget.java:1171)
	at org.eclipse.swt.widgets.Control.gtk_commit(Control.java:1970)
	at org.eclipse.swt.widgets.Widget.windowProc(Widget.java:1424)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:3796)
	at org.eclipse.swt.internal.gtk.OS._gtk_im_context_filter_keypress(Native Method)
	at org.eclipse.swt.internal.gtk.OS.gtk_im_context_filter_keypress(OS.java:4795)
	at org.eclipse.swt.widgets.Control.filterKey(Control.java:1525)
	at org.eclipse.swt.widgets.Control.gtk_key_press_event(Control.java:2075)
	at org.eclipse.swt.widgets.Composite.gtk_key_press_event(Composite.java:637)
	at org.eclipse.swt.widgets.Widget.windowProc(Widget.java:1434)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:3796)
	at org.eclipse.swt.internal.gtk.OS._gtk_main_do_event(Native Method)
	at org.eclipse.swt.internal.gtk.OS.gtk_main_do_event(OS.java:5245)
	at org.eclipse.swt.widgets.Display.eventProc(Display.java:1133)
	at org.eclipse.swt.internal.gtk.OS._g_main_context_iteration(Native Method)
	at org.eclipse.swt.internal.gtk.OS.g_main_context_iteration(OS.java:1427)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2838)
	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1914)
	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1878)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:419)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at de.upb.aws2html.main.Application.run(Application.java:20)
	at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:78)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336)
	at org.eclipse.core.launcher.Main.basicRun(Main.java:280)
	at org.eclipse.core.launcher.Main.run(Main.java:977)
	at org.eclipse.core.launcher.Main.main(Main.java:952)