by Carlo Maesen.
I upgraded moodle 2.3.1 to version 2.5.1+ successfully. I used the following link: http://docs.moodle.org/25/en/Upgrading_to_Moodle_2.5
After the upgrade I try to login in moodle using the admin account. The next screen contains the following error:
Coding error detected, it must be fixed by a programmer: require_js() was removed, use new JS api
How can I solve this problem ?