When i try to export this pops up? Fix?

You have two focus trees for GRE - this isn't valid, and the game would probably throw an error (would definitely only load one of the two trees anyway)

I've swapped out the Greece Demertzis' tag from GRE to GRE2 - You can edit these if needs be by clicking the settings icons next to your focus(es) at https://edge.hoi4modding.com/mod/1240#focus-tree

Thanks