Hello everyone !
I have the "Could not restore modules" problem too...
Like Pauline, I created a backup on a Moodle 1.9.11 online installation and I tried to restore the course on a Moodle 1.9.19 (Moodle4Mac).
The problem occurs everytime I try to restore a course with Nanogong data (The "could not restore" message appears after trying to restore the Nanogong exercises). I tried to restore the courses without these data and it works perfectly ! But sadly, even if I'm pretty sure the problem come from the Nanogong add-on, I can't do without it...
I enabled debugging (full and developper), but I have absolutely no error message, except the "Could not restore" one. So I'm totally blind here. :/
Could anyone help me on this ?
Thank you for your help ! ;)