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java.lang.NullPointerException: 	at org.dspace.xmlworkflow.WorkflowUtils.deleteRoleGroup(WorkflowUtils.java:215)	at org.dspace.app.xmlui.aspect.administrative.FlowContainerUtils.processDeleteCollectionRole(FlowContainerUtils.java:538)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:155)	at org.mozilla.javascript.NativeJavaMethod.call(NativeJavaMethod.java:243)	at org.mozilla.javascript.Interpreter.interpretLoop(Interpreter.java:3237)