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Idk french but the solution is delete the module gamification, go to your ftp and in the folder module find the folder gamification an put _ at the begining, and you can go to your backoffice again.
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Idk french but the solution is delete the module gamification, go to your ftp and in the folder module find the folder gamification an put _ at the begining, and you can go to your backoffice again.