I was just getting ready to upgrade my production Moodle site. After upgrading my experimental site, I am getting the following warning messages (see graphic below). This seems to be related to the Topcoll plugin that I am using (Gareth's). If I go to a course that is not using Topcoll, I do not get these messages. Of course, I can not show this message by turning debug messages off, but this is why I leave it on. The warning messages show right after a section topic.
Also, this is the first time that I am getting these error messages, they did not occur in Moodle 2.4+, only in Moodle 2.4.1+.
I am not sure if this could be a problem in Topcoll or in Moodle, which is why I am posting it here. I will add a graphic showing the problem.