java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.atlassian.jira.web.action.issue.MoveSubTaskChooseOperation.doDefault(MoveSubTaskChooseOperation.java:51)
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 webwork.util.InjectionUtils$DefaultInjectionImpl.invoke(InjectionUtils.java:70)
at webwork.util.InjectionUtils.invoke(InjectionUtils.java:56)
at webwork.action.ActionSupport.invokeCommand(ActionSupport.java:433)
at webwork.action.ActionSupport.execute(ActionSupport.java:157)
at com.atlassian.jira.action.JiraActionSupport.execute(JiraActionSupport.java:55)
at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:139)
at com.atlassian.jira.web.dispatcher.JiraServletDispatcher.service(JiraServletDispatcher.java:171)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

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