I'm having a similar problem. My game at first wouldn't open due to some mods that broke after the newest patch update. Then, when I open the game and try to play a world it comes up with "Error 123:9d5d0e8f:ac836316" and then something about restarting my game. I removed my mods and tried to remove more mods that I never use or may be broken, but it never seemed to work. I repaired the game, uninstalled my game, removed all my mods, everything. I turned off my script mods and the error still showed up. I don't know what to do anymore. Please help.