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

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java.lang.NullPointerException:
at org.kuali.student.enrollment.registration.client.service.impl.CourseRegistrationCartClientServiceImpl.addCourseToCart(CourseRegistrationCartClientServiceImpl.java:224)
at org.kuali.student.enrollment.registration.client.service.impl.CourseRegistrationCartClientServiceImpl.addCourseToCartRS(CourseRegistrationCartClientServiceImpl.java:116)
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)

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