java.lang.IllegalArgumentException: len=-1 < 0
   at org.netbeans.editor.BaseDocument.handleRemove(BaseDocument.java:945)
   at org.netbeans.editor.BaseDocument$FilterBypassImpl.remove(BaseDocument.java:2583)
   at javax.swing.text.DocumentFilter.remove(DocumentFilter.java:79)
   at org.openide.text.CloneableEditorSupport$DocFilter.remove(CloneableEditorSupport.java:2387)
   at org.netbeans.editor.BaseDocument.remove(BaseDocument.java:931)
   at org.netbeans.modules.web.core.syntax.completion.api.JspCompletionItem$1.run(JspCompletionItem.java:241)
   at org.netbeans.editor.GuardedDocument.runAtomic(GuardedDocument.java:323)
   at org.netbeans.modules.web.core.syntax.completion.api.JspCompletionItem.substituteText(JspCompletionItem.java:233)
   at org.netbeans.modules.web.core.syntax.completion.api.JspCompletionItem.substituteText(JspCompletionItem.java:225)
   at org.netbeans.modules.web.core.syntax.completion.api.JspCompletionItem$PrefixTag.substituteText(JspCompletionItem.java:474)
   at org.netbeans.modules.web.core.syntax.completion.api.JspCompletionItem.defaultAction(JspCompletionItem.java:203)
   at org.netbeans.modules.web.core.syntax.completion.api.JspCompletionItem$PrefixTag.defaultAction(JspCompletionItem.java:500)
   at org.netbeans.modules.editor.completion.CompletionImpl.dispatchKeyEvent(CompletionImpl.java:676)
   at org.netbeans.modules.editor.completion.CompletionImpl.keyPressed(CompletionImpl.java:404)
   at java.awt.AWTEventMulticaster.keyPressed(AWTEventMulticaster.java:250)
   at java.awt.Component.processKeyEvent(Component.java:6493)
   at javax.swing.JComponent.processKeyEvent(JComponent.java:2832)
   at java.awt.Component.processEvent(Component.java:6312)
   at java.awt.Container.processEvent(Container.java:2236)
   at java.awt.Component.dispatchEventImpl(Component.java:4891)
   at java.awt.Container.dispatchEventImpl(Container.java:2294)
   at java.awt.Component.dispatchEvent(Component.java:4713)
   at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1954)
   at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:806)
   at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1074)
   at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:945)
   at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:771)
   at java.awt.Component.dispatchEventImpl(Component.java:4762)
   at java.awt.Container.dispatchEventImpl(Container.java:2294)
   at java.awt.Window.dispatchEventImpl(Window.java:2750)
   at java.awt.Component.dispatchEvent(Component.java:4713)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
   at java.awt.EventQueue.access$500(EventQueue.java:97)
   at java.awt.EventQueue$3.run(EventQueue.java:709)
   at java.awt.EventQueue$3.run(EventQueue.java:703)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
   at java.awt.EventQueue$4.run(EventQueue.java:731)
   at java.awt.EventQueue$4.run(EventQueue.java:729)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)