SOLVED

[raggedpelt98]

I exported a map, copied the files and put them in a rar file, came back awhile later, and FH wouldnt open. I tried deleting a few fhms, but that didnt work. Will I have to re-install? ;w;

[PrettyReckless]

Double check if you have any duplicated particles.
They should be havin' _0 _1 etc behind their names.

[greenart6]

I suggest going into Feralheart>Media>Particles and deleting any duplicate files with _0 or _1 after them, also do the same in your my_objects folder.

If that doesn't work, you most likely will have to reinstall ;-;

[raggedpelt98]

Thanks guys! The particles did duplicate, I`m glad I went here for help instead of just re-installing