Describe the bug
Minecraft opens up, then closes.

This only happens if Optifine is enabled, disabling it allows the game to start loading properly.

Logs
Log is here.

Additional context
Lots of mods here, I'm well aware there's no obligation to help but I'd still appreciate any effort.

Something seems to be very wrong with your instance; OptiFine is throwing a lot of errors about classes being modified which I don't see in my own pack. Are you certain the crash does not happen without Fluidlogged API installed?

closing due to inactivity, feel free to reopen if you can confirm this is caused by this mod