Your data is from an old version of the game ERROR

First of all; I didnt used a LVL hack / prestige hack.

Since an hour ago I get the error when I press play:

Your data is from an old version of the game.


You must reset your rank and unlocks to continue.

Well im not going to start all over again, is this a known error ?
Can't find a solution!

Greetings, Herrflick205 (steam account)