I searched and could not find a second class.ActiveRecord.php anywhere. I have two separate Ilias installations on that server and the folder structures seem identical. With one system everything works, with the other it doesn't. There must be some remains of an old photo gallery or the old ActiveRecord, but as I said, I removed everything in the file system, before I installed the new version of photo gallery. Could there be any leftovers in MySQL that cause the error?
This is the complete apache error message:
PHP Fatal error: Cannot redeclare class ActiveRecord in (/...)/ilias3/Services/ActiveRecord/class.ActiveRecord.php on line 23, referer: (...)/ilias.php?ref_id=4132&cmdClass=ilrepositorygui&cmdNode=7g&baseClass=ilrepositorygui