Hello, I am having the same problem as well. I recently bought Arma 3 like 3 weeks ago and it has been working fine until yesterday. Sometimes it wouldn't work at launch and/or it will kick me out of the game with the same error. I have tried all the steps you suggested, and I still couldn't find the error. Can it be a bug (wish I'm hoping) or is something wrong with my computer? I recently bought a new computer and I had it for atleast a month now.