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

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java.lang.NullPointerException:
at org.kuali.student.enrollment.registration.client.service.impl.util.CourseRegistrationAndScheduleOfClassesUtil.dayDisplayHelper(CourseRegistrationAndScheduleOfClassesUtil.java:552)
at org.kuali.student.enrollment.registration.client.service.impl.CourseRegistrationCartClientServiceImpl.getCartForUserAndTerm(CourseRegistrationCartClientServiceImpl.java:674)
at org.kuali.student.enrollment.registration.client.service.impl.CourseRegistrationCartClientServiceImpl.addCourseToCart(CourseRegistrationCartClientServiceImpl.java:309)
at org.kuali.student.enrollment.registration.client.service.impl.CourseRegistrationCartClientServiceImpl.addCourseToCartRS(CourseRegistrationCartClientServiceImpl.java:120)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)

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