After the alloy forgery proceeded to crash my game, I looked around here and found the Charm Fixer, tried it, and now I get text saying "Invalid Multiblock Confuguration" instead, and I cant find anything about this issue

Did you build the correct multiblock structure? This is depicted on the mod page and the wiki

OH SHOOT THATS PROBABLY IT IM SO SO SORRY.

Yeah that was it... im so so sorry for wasting your time!!!