I got a similar error with the Subnautica trainer. Go into the Steam directory where the game exe is and copy a shortcut of it to the desktop. Once that is accomplished right click the trainer and start with admin rights as always and also do it with the shortcut of Resident Evil 6 you just created on the desktop. That should work. It did for Subnautica for me.
Unforently this did not work for me. I still am given the error.
I have tried to both run the trainer and the game as Admin.
This is the error I get Error: 0 : teleport: Cannot find aob!
I have only tried RE 5 and RE6. In the past the RE6 trainer has worked with no error.
No, there wasn't an update to the game but a review of the trainer. That's all.