## WeBWorK Main Forum

### Error in Translator.pm in a problem using ANS(RationalExpEvaluator($answer,"x")); ### Error in Translator.pm in a problem using ANS(RationalExpEvaluator($answer,"x"));

by Daniel An -
Number of replies: 0
Hi, we had some warning messages and error when using some questions from CollegeOfIdaho problem set.
For example, if I put the correct answer to the problem:
Library/CollegeOfIdaho/setAlgebra_06_01_MultDivRationalExpressions/61IntAlg_18_MultDivRatExp.pg
it just posts some warning message and does not grade the problem at all.

The warning messages shown are:

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## WeBWorK Warnings

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### Warning messages

• Use of uninitialized value \$new_rh_ans_evaluation_result in concatenation (.) or string at /opt/webwork/pg/lib/WeBWorK/PG/Translator.pm line 1337
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Previously I was using version 2.11 and I had a similar problem albeit a different warning message.
So I upgraded webwork2, pg, libraries and MathJax to the latest version, and updated the database following http://webwork.maa.org/wiki/Release_notes_for_WeBWorK_2.12#Upgrade_Instructions, but the warning message did not get resolved.

It seems like all the problems using RationalExpEvaluator spits out this warning message. Any ideas?