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java.lang.NullPointerException: 	at com.m7.wide.jstudio.appexplorer.ArtifactController.reload(UnknownSource)	at com.m7.wide.eclipse.jstudio.appexplorer.AppExplorerTreeViewer.open(UnknownSource)	at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:429)	at org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:616)	at org.eclipse.core.runtime.Platform.run(Platform.java:747)	at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:427)	at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:635)	at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:731)	at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:211)	at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:206)	at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:238)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:82)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:796)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:2772)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2431)	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1377)	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1348)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:254)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:141)	at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:96)	at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:335)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:273)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:129)	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.core.launcher.Main.basicRun(Main.java:183)	at org.eclipse.core.launcher.Main.run(Main.java:659)	at org.eclipse.core.launcher.Main.eclipse_main(Main.java:628)	at org.eclipse.core.launcher.Main$3.run(Main.java:638)	at java.awt.event.InvocationEvent.dispatch(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.run(Unknown Source)