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

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java.lang.NullPointerException:
at org.occiware.clouddesigner.occi.emfgen.OCCIExtension2Ecore.convertAttribute(OCCIExtension2Ecore.java:156)
at org.occiware.clouddesigner.occi.emfgen.OCCIExtension2Ecore.convertKind(OCCIExtension2Ecore.java:113)
at org.occiware.clouddesigner.occi.emfgen.OCCIExtension2Ecore.convertExtension(OCCIExtension2Ecore.java:62)
at org.occiware.clouddesigner.occi.emfgen.ui.popup.actions.ConvertAction.generateEMFModels(ConvertAction.java:147)
at org.occiware.clouddesigner.occi.emfgen.ui.popup.actions.ConvertAction.run(ConvertAction.java:90)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:595)
at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:511)
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 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:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
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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