Forge v1.12.2 not starting up.

[socixxs]

I had some mods downloaded already and it worked. But then closed the game to download some more mods and when I went back to test the new mods and the game would crash on startup. So, I decided to delete the new mods one by one until I could get the game to start up, but even after I deleted all of the new mods, the game still won't startup. Everything but forge is working. Any fixes? Or even if my Forge is  forever broken, could you tell me why?