It finally worked. Did it all as it said i the tweet.
First i disabled the cloud sync in steam under settings/cloud-
Then i deleted everything in the Dayz folder c\users\"username\Documents\Dayz. So that folder is empty.
Then i deleted 221100 folder and started the game.
Hope it works out for ya guys.

Hi. I have the same problem with the same error code. Have tried to uninstall then install, and changed user to admin and tried to run Dayz as admin. But still get the same error as you. My Dayz also worked perfectly with 1.08.