DevilsRiteHand

as I have never used it I cannot tell you why it is happening but I can tell you what is happening. There is a mod called Mixin that is erroring out, not surprising considering the purpose of Mixin is to let you run other version mods on Minecraft. ex. 1.8 Minecraft with Mixin can run 1.7 mods. attempt to get the game running with only 1.19 mods and get rid of mixin