java.lang.AssertionError
        at org.netbeans.api.java.source.ui.ScanDialog.runWhenScanFinished(ScanDialog.java:83)
        at org.netbeans.modules.groovy.support.GroovyActionProvider.invokeAction(GroovyActionProvider.java:144)
        at org.netbeans.modules.groovy.support.LookupMergerSupport$MergedActionProvider.invokeAction(LookupMergerSupport.java:110)
        at org.netbeans.modules.project.ui.actions.FileCommandAction.actionPerformed(FileCommandAction.java:96)
        at org.netbeans.modules.project.ui.actions.LookupSensitiveAction.actionPerformed(LookupSensitiveAction.java:157)
        at org.netbeans.modules.groovy.support.ScriptExecSupport.runScript(ScriptExecSupport.java:112)
        at org.netbeans.modules.groovy.support.RunScriptAction.performAction(RunScriptAction.java:70)
        at org.openide.util.actions.NodeAction$DelegateAction$1.run(NodeAction.java:581)
        at org.netbeans.modules.openide.util.ActionsBridge$ActionRunnable.actionPerformed(ActionsBridge.java:111)
        at org.netbeans.core.ModuleActions.invokeAction(ModuleActions.java:104)
        at org.netbeans.modules.openide.actions.ActionsBridgeImpl.invokeAction(ActionsBridgeImpl.java:52)
        at org.netbeans.modules.openide.util.ActionsBridge$ActionRunnable.doRun(ActionsBridge.java:102)
        at org.netbeans.modules.openide.util.ActionsBridge$1.run(ActionsBridge.java:71)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:561)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:986)