org.netbeans.DuplicateException: created from MultiFileObject@63244581[Modules/org-netbeans-core-startup-base.xml] is a duplicate of jar:file:/home/ondrejd/Software/netbeans-dev-201503080001/platform/core/core-base.jar!/META-INF/MANIFEST.MF
   at org.netbeans.ModuleManager.subCreate(ModuleManager.java:983)
   at org.netbeans.ModuleManager.create(ModuleManager.java:812)
Caused: java.io.IOException: org.netbeans.DuplicateException: created from MultiFileObject@63244581[Modules/org-netbeans-core-startup-base.xml] is a duplicate of jar:file:/home/ondrejd/Software/netbeans-dev-201503080001/platform/core/core-base.jar!/META-INF/MANIFEST.MF
   at org.netbeans.core.startup.ModuleList.createModule(ModuleList.java:192)
   at org.netbeans.core.startup.ModuleList$Listener.stepCreate(ModuleList.java:1365)
   at org.netbeans.core.startup.ModuleList$Listener.access$1300(ModuleList.java:1007)
   at org.netbeans.core.startup.ModuleList$Listener$1.run(ModuleList.java:1230)
   at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:127)
   at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:499)
   at org.netbeans.core.startup.ModuleList$Listener.run(ModuleList.java:1207)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1425)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2038)