java.lang.AssertionError: 
Event: org.openide.explorer.view.VisualizerEvent$Removed
Original event: org.openide.nodes.NodeMemberEvent
current vis. nodes:
Indexes: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 
org.openide.nodes.NodeMemberEvent[node=org.netbeans.modules.viewmodel.TreeModelNode@c9beea[Name=, displayName='AWT-EventQueue-0' running], add=false
  0 at 0
  1 at 1
  2 at 2
  3 at 3
  4 at 4
  5 at 5
  6 at 6
  7 at 7
  8 at 8
  9 at 9
  10 at 10
  11 at 11
  12 at 12
  13 at 13
  14 at 14
  15 at 15
  16 at 16
  17 at 17
  18 at 18
  19 at 19
  20 at 20
  21 at 21
  22 at 22
  23 at 23
  24 at 24
  25 at 25
  26 at 26
  27 at 27
  28 at 28
  29 at 29
  30 at 30
  31 at 31
  32 at 32
  33 at 33
  34 at 34
  35 at 35
  36 at 36
  37 at 37
  38 at 38
  39 at 39
  40 at 40
  41 at 41
  42 at 42
]
curr. snapshot: java.util.Collections$EmptyList
[]
prev. snapshot: org.openide.nodes.EntrySupport$Default$DefaultSnapshot
[org.netbeans.m
        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)