finally they started banning turkish trollers
thats the solution
dont know why though (could be any 3rd party programm running)
or you fucking cheat
restarted steam and it worked for me
delete local games files backup files and back them up again
or just backup games files for the first time
Note when you verify the integrity and have x errors you have to backup x amount of times
its happening to a lot of people this last 2 weeks, best option is to wait.
Fully stop steam in task manager then verify game.
Had this for a year, reinstalled windows at some point to fix it.
It has happened to me in the last month or so, a few times. I just restart the game a couple of times and It usually works or restart steam completely. After a few times It's fixed