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Build: NetBeans IDE Dev (Build 200809251401) VM: Java HotSpot(TM) Client VM, 11.0-b14, Java(TM) SE Runtime Environment, 1.6.0_10-rc-b27 OS: Windows Vista, 6.0, x86 User comments: Happened when i opened multiple(4) projects. STACKTRACE: (first 10 lines) java.lang.AssertionError: java.beans.PropertyVetoException: at org.apache.tools.ant.module.nodes.AntNavigatorPanel$1Panel$1.run(AntNavigatorPanel.java:124) at org.openide.util.Mutex.postRequest(Mutex.java:1251) at org.openide.util.Mutex.postReadRequest(Mutex.java:565) at org.apache.tools.ant.module.nodes.AntNavigatorPanel$1Panel.requestFocusInWindow(AntNavigatorPanel.java:116) at org.netbeans.modules.navigator.NavigatorTC.requestFocusInWindow(NavigatorTC.java:250) at org.netbeans.core.windows.view.ui.AbstractModeContainer.focusSelectedTopComponent(AbstractModeContainer.java:166) at org.netbeans.core.windows.view.ModeView.focusSelectedTopComponent(ModeView.java:161) at org.netbeans.core.windows.view.ViewHierarchy.activateModeView(ViewHierarchy.java:395) at org.netbeans.core.windows.view.ViewHierarchy.activateMode(ViewHierarchy.java:389) at org.netbeans.core.windows.view.DefaultView.changeGUI(DefaultView.java:444)
*** This issue has been marked as a duplicate of 146284 ***
verified duplicate