|More info on this problem...
After the first problem is attempted, the problem is deleted from the
set for that student. And, the following error is produced
WeBWorK has encountered warnings while processing your request. If this
occured when viewing a problem, it was likely caused by an error or
ambiguity in that problem. Otherwise, it may indicate a problem with
the WeBWorK system itself. If you are a student, report these warnings
to your professor to have them corrected. If you are a professor,
please consult the warning output below for more information.
* Argument "" isn't numeric in addition (+) at /opt/webwork2/lib/WeBWorK/ContentGenerator/ProblemSet.pm line 359.
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