[ww-bugs] Bug 4367: New: error in AnswerChecker.pm

[bugzilla-daemon at webwork.maa.org]

http://bugs.webwork.maa.org/show_bug.cgi?id=4367

           Summary: error in AnswerChecker.pm
           Product: Problem Libraries
           Version: unspecified
          Platform: PC
               URL: /opt/webwork/courses/kth-sf1633/templates/Library/METU
                    -NCC/Diff_Eq/pde-heat2.pg_with_problemSeed=2001
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Library (OPL)
        AssignedTo: gjennings at csudh.edu
        ReportedBy: kurlberg at math.kth.se
        Web browser ---
           version:


Hi,

A student reported the following somewhat cryptic error message:

> WeBWorK Warnings
> 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.
> 
> Warning messages
> Please inform your instructor that an error occurred while checking your answer at [PG]/lib/Value/AnswerChecker.pm line 252
> Request information
> Time	Sun Oct 06 15:26:26 2019
> Method	POST
> URI	/webwork2/kth-sf1633/hw5/4/

I poked around a bit in the problem code, but AnswerChecker.pm appears
to one of the standard libraries and I'm getting more than a bit lost.

The file in question appears to be given by

> Editing set hw5/problem 4 in file 
> '[TMPL]/Library/METU-NCC/Diff_Eq/pde-heat2.pg


and in

  https://courses1.webwork.maa.org/webwork2/kth-sf1633/instructor/setmaker/

there is a similarly named file, namely

Library/METU-NCC/Diff_Eq/pde-heat2.pg.

so I believe I'm using the latest version from the problem from the OPL
directory (or!?).

Is there a bug in the problem, or should I just upgrade the problem to a
fixed version?  (If the latter, I would very much appreciate a hint on how
to do it.)

Many thanks in advance. 

Best,
Pär

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