I installed the Collapsed Topic Plugin on a Campus Virtual running Moodle 3.1. The Moodle was in Traditional Spanish (ES), however after installed the Collapsed Topic plugin the Moodle installation changed to English language (EN), and I am getting some errors that I did not have before the installation of the plugin.
Specifically when I try to grade some task of students and got the error:
“Undefined - Invalid parameter value detected”
Could you please let me know what is going on?
I am in a hurry; I have looked on Internet and nothing.
I cannot think of anything that CT does that could cause this, thus I believe that you've installed it incorrectly or it is to do with something else you did at the same time.