Okay so i managed to solve the issue.
I saw an arma 3 post and a dev suggested that it had something to do with dots and comma's and such and he/she suggested a new steam library to be made. I made a new steam library and removed all the addons as well just to be sure and it magically launches. Issue solved but maybe a good idea to save this solution somewhere ^^

Yes they are . Ive installed the most frequent one. This happened after i installed dayz tools and pbo manager. I started to experience this issue yesterday because the day before i installed the dayz tools and pbo manager and i had not launched the game that day.