Run arma through steam, then press play on the launcher.

l, i tried one form from here where i verified my game and run my game as admin, i tried another from where i replaced my BEClient.dll, deleting files then verifying my game, putting -useBE in my launch options. That is all i have tried in order to fix it. But when i try and play Arma 3 it brings me to the launcher, i click play, and it gives me the error but it starts the game.