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SEVERE [org.openide.util.Exceptions] java.lang.IllegalThreadStateException at java.lang.ThreadGroup.addUnstarted(ThreadGroup.java:832) at java.lang.Thread.init(Thread.java:344) at java.lang.Thread.<init>(Thread.java:565) at java.util.concurrent.Executors$DefaultThreadFactory.newThread(Executors.java:542) at java.util.concurrent.ThreadPoolExecutor.addThread(ThreadPoolExecutor.java:672) at java.util.concurrent.ThreadPoolExecutor.addIfUnderMaximumPoolSize(ThreadPoolExecutor.java:721) at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:657) at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:92) at org.netbeans.modules.dlight.api.execution.DLightToolkitManagement.createSession(DLightToolkitManagement.java:145) at org.netbeans.modules.cnd.gizmo.actions.GizmoRunActionHandler.execute(GizmoRunActionHandler.java:105) at org.netbeans.modules.cnd.makeproject.api.ProjectActionSupport$HandleEvents.go(ProjectActionSupport.java:330) at org.netbeans.modules.cnd.makeproject.api.ProjectActionSupport$HandleEvents.executionFinished(ProjectActionSupport.java:390) at org.netbeans.modules.cnd.makeproject.api.DefaultProjectActionHandler.executionFinished(DefaultProjectActionHandler.java:286) at org.netbeans.modules.cnd.api.execution.NativeExecutor.fireExecutionFinished(NativeExecutor.java:400) at org.netbeans.modules.cnd.api.execution.NativeExecutor.executionFinished(NativeExecutor.java:356) at org.netbeans.modules.cnd.api.execution.NativeExecutor.run(NativeExecutor.java:316) [catch] at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:151)
Fixed a while ago in http://hg.netbeans.org/main/rev/28881468c951