I only have one mission on esseker (which uses CUP cores but NOT CUP maps). I have only the required mods to run the mission with cup maps as well and I get that message, however, if I remove CUP maps I get a different error message when I try to load the game. It crashes the game and gives me this message prompt. (it still starts up fine, but the load function still doesn't work)
Along with the 2 standard error messages when crashing:
I skimmed through the report, and couldn't find anything useful or make much sense of it. While I could upload the report I doubt it would help resolve the issue.
Also, thanks for trying to help!