by Eva Adam.
Thanks, this also explains why I received the error message in the case of the first submission (it was within 10 minutes, I ran the cron manually - normally our cron is scheduled every 15 minutes, so we won't have this problem in the producton site).
My last question (at the moment) is why I cannot see the student disclosure message when I upload an assignment with Turnitin enabled (in a student account)?
I have to tell you that your plugin is much better than Turnitin Direct Thank you for all your help.
Éva