Metahuman creator won't open for a metahuman already assembled.

I previously had created these metahumans and assembled them but now I want to go back and change parts but when I try and open the metahuman creator it doesn’t open.

when I try to open it I get this error.

I had also created 2 other metahumans along side the 2 in the first image but their BP’s and metahuman creator files have gone missing along side all their other files for those 2 metahumans.