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java.lang.NullPointerException: 	at java.lang.String.compareTo(String.java:1139)	at org.kuali.student.enrollment.class2.courseoffering.service.impl.CourseOfferingManagementViewHelperServiceImpl$2.compare(CourseOfferingManagementViewHelperServiceImpl.java:366)	at org.kuali.student.enrollment.class2.courseoffering.service.impl.CourseOfferingManagementViewHelperServiceImpl$2.compare(CourseOfferingManagementViewHelperServiceImpl.java:361)	at java.util.TimSort.countRunAndMakeAscending(TimSort.java:324)	at java.util.TimSort.sort(TimSort.java:189)	at java.util.TimSort.sort(TimSort.java:173)	at java.util.Arrays.sort(Arrays.java:659)	at java.util.Collections.sort(Collections.java:217)	at org.kuali.student.enrollment.class2.courseoffering.service.impl.CourseOfferingManagementViewHelperServiceImpl.build_AOs_RGs_AOCs_Lists_For_TheCourseOffering(CourseOfferingManagementViewHelperServiceImpl.java:361)	at org.kuali.student.enrollment.class2.courseoffering.service.impl.CourseOfferingManagementViewHelperServiceImpl.build_AOs_RGs_AOCs_Lists_For_TheCourseOffering(CourseOfferingManagementViewHelperServiceImpl.java:293)	at org.kuali.student.enrollment.class2.courseoffering.util.CourseOfferingManagementUtil.reloadTheCourseOfferingWithAOs_RGs_Clusters(CourseOfferingManagementUtil.java:594)	at org.kuali.student.enrollment.class2.courseoffering.controller.CourseOfferingManagementController.reloadManageCO(CourseOfferingManagementController.java:413)	at org.kuali.student.enrollment.class2.courseoffering.controller.CourseOfferingManagementController$$FastClassByCGLIB$$ea22fca6.invoke()	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)