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Build: NetBeans IDE Dev (Build 201003180200) VM: Java HotSpot(TM) 64-Bit Server VM, 14.3-b01-101, Java(TM) SE Runtime Environment, 1.6.0_17-b04-248-10M3025 OS: Mac OS X Stacktrace: java.lang.ClassNotFoundException: org.netbeans.modules.bugtracking.util.MylynUtils at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(AccessController.java:0) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:315) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:330) at java.lang.ClassLoader.loadClass(ClassLoader.java:250)
Created attachment 95966 [details] stacktrace
*** Bug 182916 has been marked as a duplicate of this bug. ***
Could it be you updated your jira plugin sometime after 20100322. The missing class came in after your build was created.