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null pointer exception during mock exam

Gc Massri
Posts: 1
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Just a I'm very new to the forum.
I just tried for the first time the mock exam at: http://www.javaranch.com/carl/scwcd/scwcd_mock.jsp
and after (the last?) question I got:

Error page Scwcd_Error

An error occured in the bean. Error Message is: null
Stack Trace is :

at com.javaranch.jspbeans.scwcd.QuizBean.execute(QuizBean.java:216)
at __jspPage730_carl_scwcd_scwcd_mock_jsp._jspService(__jspPage730_carl_scwcd_scwcd_mock_jsp.java:89)
at com.orionserver.http.OrionHttpJspPage.service(.:56)
at com.evermind._cp._vhc(.:5639)
at com.evermind.server.http.JSPServlet.service(.:31)
at com.evermind._deb._lnc(.:514)
at com.evermind._deb._wmb(.:170)
at com.evermind._co._wbb(.:581)
at com.evermind._co._fs(.:189)
at com.evermind._bt.run(.:62)

Did anybody get this problem before ? I left a couple of question un-answered, could it this be the origin of the exception?

PS: Not sure this is relevant to this forum: please be free to move this into a more appropriated forum.
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