UsingWW: Debugging a (simple?) product rule question - answer submission not working right

WeBWorK Problems

Debugging a (simple?) product rule question - answer submission not working right

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Spoke too soon. Just got another email from a student with the error, but on a different problem. Probably there's one misbehaving achievement badge? I'm not sure the error gives me enough to track that down. Or maybe I just need to cut down on the number of achievements available. (I assigned them all since that seemed simpler.)

This student gave a bit more detail on the error:
The error message from webwork

Re: Debugging a (simple?) product rule question - answer submission not working right

by Andras Balogh - Sunday, 31 January 2021, 4:39 PM

I get the same error message for questions with many entries (8x6 matrix (48 entries)) AND with achievements enabled AND for incorrect answers. For smaller matrices or with achievements deleted or with correct answer there is no error message.