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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)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)