Idk if this is the right place but its off topic and about gaming but its still support... anyway..

Yes i have tried steam support but they don't answer

When i start a game on steam it starts to validate the files every single time and then when the game is just about to get to the menu it crashes and i dont get WHY?! in the steam log it says that ''a Pool is missing''? im like wtf!? So can anyone help me? It would be awesome! Btw im on a mac. Here is the steam.log: steam.log.zip

Ask if you want to know something i will answer as good as i can.