I cant edit my game at all, i was given mod status after it was abandoned years ago, and i understand why they made it so bare bones. I hear the "-" symbol messes things up but the problem is that its actually IN the name of the game and I cant edit the game title, I cant add platforms or anything. Even if I dont change anything it freaks out and continues to have the error

also they are ending at jpg at the end of the url, so im pretty sure im trimming correctly

Try changing the url from rally-x to rallyx.

It worked! im not used to fixing a page from scratch very often so i kept thinking a needed an actual image address, i literally just took the "-" out from the default that was there. Thank you!