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XF 1.3 Server error

Hello, since i use Xenforo, i never had any problem but yesterday, a big issue crash my forum, i don't know why and how to resolve that if you can help. So i can't log to the admin area, i don't understand ^^



XenForo moderator
Staff member
At some point last few days 1+1 made some alterations to their hosting setup, using a php and mysql library which are incompatible with each other and thus the error your getting.

At this point the best option is to ask them to change your php version to 5.5, which seems to work correctly at the moment.
Yes, work great now, i can change the version in the 1and1 admin panel. Thank you very much for help!! (y) cheers!!