java.lang.AssertionError: 
Event: org.openide.explorer.view.VisualizerEvent$Removed
Original event: org.openide.nodes.NodeMemberEvent
current vis. nodes:
Indexes: 0 1 2 3 4 5 6 7 8 
org.openide.nodes.NodeMemberEvent[node=org.netbeans.modules.viewmodel.TreeModelNode@7563dedf[Name=, displayName='testLayer' running], add=false
  0 at 0
  1 at 1
  2 at 2
  3 at 3
  4 at 4
  5 at 5
  6 at 6
  7 at 7
  8 at 8
]
curr. snapshot: java.util.Collections$EmptyList
[]
prev. snapshot: org.openide.nodes.EntrySupport$Default$DefaultSnapshot
[org.netbeans.modules.viewmodel.TreeModelNode@2a5355d4[Name=, displayName=DBIndex.storeVersionList:107], org.netbeans.modules.viewmodel.TreeModelNode@4527e701[Name=, displayName=DBObjectHelper.writeCreatedRecord:519], org.netbeans.modules.viewmodel.TreeModelNode@3eaf161f[Name=, displayName=DBObjectHelper.iCollectStatements:434], org.netbeans.modules.viewmodel.TreeModelNode@58d56d5f[Name=, displayName=DBObject.iCollectStatements:4751], org.netbeans.modules.viewmodel.TreeModelNode@23ffa589[
        at org.openide.explorer.view.VisualizerChildren.removed(VisualizerChildren.java:249)
        at org.openide.explorer.view.VisualizerEvent$Removed.run(VisualizerEvent.java:132)
        at org.openide.util.Mutex.readAccess(Mutex.java:362)
        at org.openide.util.Mutex$1R.run(Mutex.java:1301)
        at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1810)
        at org.openide.util.Mutex.doWrapperAccess(Mutex.java:1320)
        at org.openide.util.Mutex.readAccess(Mutex.java:351)
        at org.openide.explorer.view.VisualizerNode$QP.run(VisualizerNode.java:707)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        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)