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This issue was reported manually by mgoe. It already has 6 duplicates Build: NetBeans IDE 7.2 Beta (Build 201205031832) VM: Java HotSpot(TM) 64-Bit Server VM, 23.0-b21, Java(TM) SE Runtime Environment, 1.7.0_04-b20 OS: Linux User Comments: GUEST: Deleting web project. Stacktrace: java.lang.NoClassDefFoundError: org/openide/util/Enumerations$RNulls at org.openide.util.Enumerations.removeNulls(Enumerations.java:161) at org.openide.filesystems.AbstractFileSystem.existingFileObjects(AbstractFileSystem.java:410) at org.openide.filesystems.AbstractFileSystem.existingFileObjects(AbstractFileSystem.java:385) at org.openide.filesystems.JarFileSystem$1.fileDeleted(JarFileSystem.java:377) at sun.reflect.GeneratedMethodAccessor176.invoke(GeneratedMethodAccessor176.java:0) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
Created attachment 120017 [details] stacktrace
*** This bug has been marked as a duplicate of bug 211962 ***