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

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java.lang.NullPointerException:
at eu.numberfour.ide.n4js.internal.AbstractN4JSCore.loadModuleFromIndex(AbstractN4JSCore.java:136)
at eu.numberfour.ide.n4js.ui.editor.EditorContentExtractor.getDescriptorForSemanticElement(EditorContentExtractor.java:104)
at eu.numberfour.ide.tester.ui.resultsview.TestResultsView$CodeSnippetToolTip.getDescriptor(TestResultsView.java:197)
at eu.numberfour.ide.tester.ui.resultsview.TestResultsView$CodeSnippetToolTip.shouldCreateToolTip(TestResultsView.java:184)
at org.eclipse.jface.window.ToolTip.toolTipCreate(ToolTip.java:334)
at org.eclipse.jface.window.ToolTip.access$2(ToolTip.java:333)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4230)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1491)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1514)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1499)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1299)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4072)
at eu.numberfour.ide.product.N4Application.start(N4Application.java:137)
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:380)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:669)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608)
at org.eclipse.equinox.launcher.Main.run(Main.java:1515)

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