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I can solve Null Exception that Exception in thread main java.lang.NullPointerException at Course.studentAdd(Course.java:72) at Main1_Registrar.main(Main1_Registrar.java:40)

I can solve Null Exception that

Exception in thread "main" java.lang.NullPointerException

at Course.studentAdd(Course.java:72)

at Main1_Registrar.main(Main1_Registrar.java:40)

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