A while ago I merged all my gameplay mods into one package and it was working just fine, I could even edit and remove mods in the package if I wanted to, I added some new mods to the package and went into the game with these new mods in the package which were working just fine, but when I wanted to open the package I got this weird error massage which made me not able to edit or even check anything in the package because after clicking ok the package shows a new empty package, I have no idea what it means so I really hope you guys can help me with it.

Aw that really sucks :\ Guess I will have to start all over again, thanks for you help tho.