java.util.ConcurrentModificationException
   at java.util.HashMap$HashIterator.nextEntry(HashMap.java:922)
   at java.util.HashMap$ValueIterator.next(HashMap.java:950)
   at org.netbeans.modules.cnd.modelimpl.platform.CsmEventDispatcher.dispatchAll(CsmEventDispatcher.java:355)
   at org.netbeans.modules.cnd.modelimpl.platform.CsmEventDispatcher.processEvent(CsmEventDispatcher.java:276)
   at org.netbeans.modules.cnd.modelimpl.platform.CsmEventDispatcher.access$600(CsmEventDispatcher.java:86)
   at org.netbeans.modules.cnd.modelimpl.platform.CsmEventDispatcher$Worker.run(CsmEventDispatcher.java:216)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.util.ConcurrentModificationException
   at org.openide.util.RequestProcessor$Task.schedule(RequestProcessor.java:1484)
   at org.netbeans.modules.cnd.modelimpl.platform.CsmEventDispatcher.registerEvents(CsmEventDispatcher.java:191)
   at org.netbeans.modules.cnd.modelimpl.platform.CsmEventDispatcher.access$800(CsmEventDispatcher.java:86)
   at org.netbeans.modules.cnd.modelimpl.platform.CsmEventDispatcher$ItemListener.filesPropertiesChanged(CsmEventDispatcher.java:443)
   at org.netbeans.modules.cnd.makeproject.NativeProjectProvider.fireFilesPropertiesChanged(NativeProjectProvider.java:347)
   at org.netbeans.modules.cnd.makeproject.NativeProjectProvider.stateChanged(NativeProjectProvider.java:822)
   at org.netbeans.modules.cnd.api.toolchain.ui.ToolsPanelSupport.fireCodeAssistanceChange(ToolsPanelSupport.java:210)
   at org.netbeans.modules.cnd.toolchain.compilerset.ToolchainValidator.applyChanges(ToolchainValidator.java:119)
   at org.netbeans.modules.cnd.toolchain.compilerset.FixCodeAssistancePanel$1.actionPerformed(FixCodeAssistancePanel.java:97)
   at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
   at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
   at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
   at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
   at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
   at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
   at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
   at java.awt.Component.processMouseEvent(Component.java:6516)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3312)
   at java.awt.Component.processEvent(Component.java:6281)
   at java.awt.Container.processEvent(Container.java:2229)
   at java.awt.Component.dispatchEventImpl(Component.java:4872)
   at java.awt.Container.dispatchEventImpl(Container.java:2287)
   at java.awt.Component.dispatchEvent(Component.java:4698)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4832)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4492)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4422)
   at java.awt.Container.dispatchEventImpl(Container.java:2273)
   at java.awt.Window.dispatchEventImpl(Window.java:2719)
   at java.awt.Component.dispatchEvent(Component.java:4698)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:747)
   at java.awt.EventQueue.access$300(EventQueue.java:103)
   at java.awt.EventQueue$3.run(EventQueue.java:706)
   at java.awt.EventQueue$3.run(EventQueue.java:704)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
   at java.awt.EventQueue$4.run(EventQueue.java:720)
   at java.awt.EventQueue$4.run(EventQueue.java:718)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:717)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)