java.io.IOException: org.netbeans.DuplicateException: C:\Program Files\NetBeans Dev 200808141419\maven1\modules\org-netbeans-modules-maven-gsf.jar is a duplicate of C:\Program Files\NetBeans Dev 200808141419\maven1\modules\org-netbeans-modules-maven-gsf.jar
        at org.netbeans.core.startup.ModuleList$Listener.stepCreate(ModuleList.java:1632)
        at org.netbeans.core.startup.ModuleList$Listener.access$2100(ModuleList.java:1305)
        at org.netbeans.core.startup.ModuleList$Listener$1.run(ModuleList.java:1534)
        at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:120)
        at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:499)
        at org.netbeans.core.startup.ModuleList$Listener.run(ModuleList.java:1511)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997)
org.netbeans.DuplicateException: C:\Program Files\NetBeans Dev 200808141419\maven1\modules\org-netbeans-modules-maven-gsf.jar is a duplicate of C:\Program Files\NetBeans Dev 200808141419\maven1\modules\org-netbeans-modules-maven-gsf.jar
        at org.netbeans.ModuleManager.subCreate(ModuleManager.java:604)
        at org.netbeans.ModuleManager.create(ModuleManager.java:480)
        at org.netbeans.core.startup.ModuleList$Listener.stepCreate(ModuleList.java:1628)
        at org.netbeans.core.startup.ModuleList$Listener.access$2100(ModuleList.java:1305)
        at org.netbeans.core.startup.ModuleList$Listener$1.run(ModuleList.java:1534)
        at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:120)
        at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:499)
        at org.netbeans.core.startup.ModuleList$Listener.run(ModuleList.java:1511)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997)