Multiconnect isn't letting my game to launch for like 2-3 days. It used to work fine earlier. Without multiconnect my game launches without any problem but with multiconnect it gets stuck on loading screen of Mojang.
Here's the complete log file: https://pastebin.com/1urnvzUT

You should find conflicting mod. Remove half of your mods and check for the problem. If the game still doesn't start, remove half of the remaining mods again.

Also if everything worked before, you can reset the mods settings by removing the config folder.