java.lang.AssertionError: line number was negative: -1
        at org.netbeans.modules.groovy.editor.api.AstPath.findPathTo(AstPath.java:134)
        at org.netbeans.modules.groovy.editor.api.AstPath.<init>(AstPath.java:102)
        at org.netbeans.modules.groovy.refactoring.GroovyRefactoringElement.<init>(GroovyRefactoringElement.java:67)
        at org.netbeans.modules.groovy.refactoring.ui.GroovyRefactoringActionsProvider$TextComponentTask.run(GroovyRefactoringActionsProvider.java:205)
        at org.netbeans.modules.groovy.refactoring.ui.GroovyRefactoringActionsProvider$TextComponentTask.run(GroovyRefactoringActionsProvider.java:171)
        at org.netbeans.modules.groovy.editor.api.parser.SourceUtils.runUserActionTask(SourceUtils.java:105)
        at org.netbeans.modules.groovy.editor.api.parser.SourceUtils.runUserActionTask(SourceUtils.java:110)
        at org.netbeans.modules.groovy.refactoring.ui.GroovyRefactoringActionsProvider$TextComponentTask.run(GroovyRefactoringActionsProvider.java:214)
        at org.netbeans.modules.groovy.refactoring.ui.GroovyRefactoringActionsProvider.doFindUsages(GroovyRefactoringActionsProvider.java:123)
        at org.netbeans.modules.refactoring.api.impl.ActionsImplementationFactory.doFindUsages(ActionsImplementationFactory.java:87)
        at org.netbeans.modules.refactoring.spi.impl.WhereUsedAction.performAction(WhereUsedAction.java:62)
        at org.netbeans.modules.refactoring.spi.impl.RefactoringGlobalAction$ContextAction.actionPerformed(RefactoringGlobalAction.java:177)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
        at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1225)
        at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1266)
        at java.awt.Component.processMouseEvent(Component.java:6134)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
        at java.awt.Component.processEvent(Component.java:5899)
        at java.awt.Container.processEvent(Container.java:2023)
        at java.awt.Component.dispatchEventImpl(Component.java:4501)
        at java.awt.Container.dispatchEventImpl(Container.java:2081)
        at java.awt.Component.dispatchEvent(Component.java:4331)
        at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4301)
        at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:3965)
        at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:3895)
        at java.awt.Container.dispatchEventImpl(Container.java:2067)
        at java.awt.Window.dispatchEventImpl(Window.java:2458)
        at java.awt.Component.dispatchEvent(Component.java:4331)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)