Please use the search functionality before reporting an issue. Also take a look at the closed issues!

Issue description:

After installing the Mekanism mods(Mekanism,Additons,Tools,Generators) and attempting to enter the server, client forge crashes.
Only shows on the server:
https://pastebin.pl/view/b7118f61

Steps to reproduce:

1. Install Mods on server and client
2. try to join on server

Version (make sure you are on the latest version before reporting):

Forge: 1.16.4 35.1.37
**Mekanism:
Mekanism-1.16.4-10.0.18.445.jar
MekanismAdditions-1.16.4-10.0.18.445.jar
MekanismGenerators-1.16.4-10.0.18.445.jar
MekanismTools-1.16.4-10.0.18.445.jar

--

**
Other relevant version:

If a (crash)log is relevant for this issue, link it here: https://pastebin.pl/view/08bb6eff

#6892 #6888 #6906, according to #6906 (comment) updating optifine fixes it or at the very least removing optifine will fix it.

Working Thanks!