I ran into issue where rendering a problem on my production server reported
Use of uninitialized value $credit{"AnSwEr0001"} in numeric eq (==) at (eval 1454) line 288.
Use of uninitialized value $credit{"AnSwEr0001"} in multiplication (*) at (eval 1454) line 304.
when the problem was rendered. This is a problem using weightedGrader.pl and parserMultiAnswer.pl.
I had set
$ans1 = Compute("ln(x)");
$ans1->{test_at} = [[0,-1],[0,1],[0,3],[0,7]];
$ans1->{checkUndefinedPoints} = 1;
in the problem, and then $ans1 was part of a MultiAnswer
$multians1 = MultiAnswer($ans1, $ans2)->with(
...
which is graded by
WEIGHTED_ANS( $multians1->cmp(), 60 );
Commenting out the line
$ans1->{checkUndefinedPoints} = 1;
solved the problem.
However, I ran into the issue only on my production server which is running a prerelease version of WW 2.15 but not when the same problem was rendered using a current devel version. I'm really not certain what different between the versions of the code running on the 2 systems made the difference between the issue occurring and not occurring.