GLucky

I would say that, but it seems that removing optifine fixed it for some reason?? Also, singleplayer works perfectly fine

I've been trying to connect to a modded server I've made. I succesfully connect, but just before joining, the game crashes on the "Saving world" screen. Crash log: https://pastebin.com/Rv5CFzj9

So I've been trying to install the 1.7.10 version of forge and it's been giving me the message mention in the title. I tried manually running the jar file through the command prompt, yet there was no difference. I need help.