I don't know... Have you ever had such an issue with your AM projects?
I'm currently having big troubles with my work PC (after installing Windows 10) and I can't check the game files for a while. If really the game returns this error to everyone, then I will try to send the work files to someone who owns AM and who could try to build the game, just in case it would change anything.
First let's see what I can do after my PC works again!