WeBWorK Problems

error message in problem display

error message in problem display

by Kenneth Luther -

Hi - Long time WW user at Valparaiso University, am now at Loyola University Chicago.  Had so much fun with WW at VU I've set it up on AWS as a totally no-risk optional practice playground for my students.  It's up and nearly working and I'm able to create problem sets, however, I am now getting an error message at pretty much any problem - either upon initial display or when trying to check an answer (image attached) : Error message from problem display: Undefined subroutine &Mojo::JSON::encode_json called at [PG]/macros/PG.pl line 1345

"Undefined subroutine &Mojo::JSON::encode_json called at [PG]/macros/PG.pl line 1345"

I have versions WebWork 2.19 / PG 2.20 . It looks like I may be behind by 1 on the current WebWork version since I initially copied it from the master held in AWS.  Could that be the culprit, or does anyone have other advice? 

error message in problem display

by Kenneth Luther -

So I successfully (I think) updated to WW 2.20, and this problem seems to have been resolved, at least based on a small number of problems I completed. 

error message in problem display

by Glenn Rice -

Using WW 2.19 with PG 2.20 would certainly be an issue.  Both WeBWorK and PG were switched to using Mojo::JSON for 2.20.  So if WeBWorK is on 2.19 and PG on 2.20, then WeBWorK would be providing the wrong JSON module.

error message in problem display

by Kenneth Luther -
Yeah, I have no idea how the releases got off track like that for me, I got this little learning (for myself) project started over the summer, it seems before WW was upgraded. I somehow ended up with the mismatch.