Save game could not be loaded

It's almost definitely been answered before, but I've started two different saves now, and both have said the saved game cannot be loaded. I know this means my file is corrupt, but is there a reason why it keeps happening? If it matters, I have Classens megapack thing downloaded, with all the nations in the game but none selected?

Could be an error with the DB you are loading, even if you don't load the leagues there could be some issues with continental competitions or the game still trying to process the leagues to some basic level

Try totally removing the megapack and seeing if that stops saves corrupting