Rust "oops" error and play button missing

Hey people , It is my first time in the forums and i don’t really know where to find these stuff or write them , I hope this is the right place :D. So I’m having a problem that when i start my rust some times the play button doesn’t come at all and i cant open the game if I have max graphs on or it will shut down, And when i go to the game with low grahps and press play button it crashes. It says something like " oops " the folder 2014-10-02_124440 error , something like that