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

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java.lang.NullPointerException:
at weblogic.security.acl.GroupImpl.addMember(GroupImpl.java:46)
at weblogic.security.acl.OwnerImpl.(OwnerImpl.java:32)
at weblogic.security.acl.AclImpl.(AclImpl.java:164)
at weblogic.servlet.security.internal.SecurityModule.auditPerm(SecurityModule.java:350)
at weblogic.servlet.security.internal.ServletSecurityManager.checkAccess(ServletSecurityManager.java:189)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:2367)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:137)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)

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