STACK

Hello to the devs and maintainers. I have an issue that I hope I'll be able to get assistance with.
I just installed STACK for the first time without issues. I enabled all the necessary PHP features, and all the extra dependencies were successfully installed. During my experimentation, I've been unable to successfully create and save any STACK question, however.
The error that keeps plaguing me is "CAS failed to return any data due to timeout.", and is displayed for the input model answer field. Note that I have no question variables. Changing the "CAS connection timeout" value (qtype_stack | castimeout) unfortunately doesn't resolve the problem; nor does changing the Maxima version.
I'm using Moodle 4.3.2 (Build: 20231222) on a Linux server with PHP 8.2. Furthermore, I'm using STACK 4.5.0 for Moodle 3.9+

Good morning Florian. It happened to me any time I do an upgrade. You just need to run the healthcheck script and recreate the Maxima image (Create Maxima image). Perhaps you also need to, temporarily, increase the CAS connection timeout to 50.
Please let me know if it worked.
Best regards

Florian,
How to resolve this is documented here: https://docs.stack-assessment.org/en/Installation/Testing_installation/#troubleshooting-an-upgrade
Some how it looks like you have either not upgraded the plugin DB correctly, or have newer code.

Hello!
We just upgraded our Moodle to version 4.1 and the Stack plugin to version 4.4.5.
We did not change the Maxima version.
However, now when using Stack, we get an error message (trying to translate into english):
"Die verwendete Version der STACK-Maxima-Bibliotheken (2022082900) stimmt nicht mit der von dieser Version des STACK-Fragetyps erwarteten (2023072101) überein."
"The version used of the STACK-Maxima-Libraries (2022082900) does not correspond to the one expected by this version of the STACK question type (2023072101)."
However, I am pretty sure that the correct Maxima version (44.0) is selected in the plugin settings.
What do I miss?
Thank you very much!
Florian

Hello I am physics teacher and I would like to use stack in Moodle
I try to follow the instruction of this page to install Stack : https://github.com/maths/moodle-qtype_stack/blob/master/doc/en/Installation/index.md
If I understand correctly I have to install gcc, gnuplot and Maxima on my server and I imagine I cannot do that from Moodle.
My Moodle version is 3.11.15+ and my Moodle is hosted on a Plesk Server so I don’t think that I have the ability to install things.
Do you know if there is a way to be able to use Stack on a Plesk server ? Contact the support of my server (what should I ask them to do ?)
Otherwise what should I consider changing my hosting ? If yes what can you recommend me for people who want to run stack on a server and Moodle who are not an expert in linux and php...
Thank you very much

Hello Team,
like Vardaan Solia, I get the same error (TIMEDOUT) after I have entered a sample solution. I have oriented my procedure 1 to 1 on the tutorial of the University of Bochum, but even so it does not work.
Is this a bug or does it have to do with a non-existent integration of maxima, I read about it in the comment from Al Spay?

Hello team, I was hoping if you could share more info about the found TIMEOUT issue that is encountered in the Question Variables text column.

Latest version of STACK works with Moodle 4.0 in our testing.

Good afternoon.
I am reluctant to upgrade my Moodle to 4.0 version because of this excellent plugin. Anyone would be so kind to comment the use of Stack in Moodle 4.0.
Best regards

Good afternoon.
Christian Milani, the last update solves the issue.
Best regards

Good afternoon!
Installed STACK plugins in MOODLE 3.11. Maxima is installed on a separate server. I can't connect STACK and Maxima. I did not find a step-by-step instruction on how to do this in the documentation (for beginners). What settings should be in maxim, what in the plugin... etc.

Hello,
we have the same problem as Carlos. Moodle 3.11.8+ and STACK 2022071300.
I will open a new issue on github.

Good evening.
I think I know what is happening. In questions with multiple answers, no matter what score I assign to each answer, STACK always assign 1 point to each one. For example, if my question of 8 points has 4 parts with 20%, 20%, 30% and 30% score for each part, I set 2, 2, 3, 3 points in order to calculate these percentages; STACK assign 1 point to each part; therefore if a student answer the question correctly, the score he gets is (1+1+1+1)/(2+2+3+3) * 8 =3.2.
If any of you gets the same behaviour please let me know.
Best regards

Good afternoon.
Thank you for this great plugin, It basically change the way I teach and evaluate my students.
I have a strange issue since the last update: the score of any question is assign incorrectly. For example, in a cuestionary with 3 questions with 6, 6 and 8 points respectively (20 points), random scores are assigned to each question so the total score could be more or less than 20. The same thing happens if Iry to recalculate the grade of past cuestionaries.
Any advice would be welcome.
Best regards

The current version of the plugin has problems on Moodle 4.0. We've fixed the problems, but there is more testing to do. I'm planning to include support for Moodle 4.0 in the text release during the summer of 2022. We will support Moodle 4.0 soon.