I am hosting a dedicated server with Mekanism installed, which also includes the addons Mekanism Tools, Mekanism Generators, and Mekanism Additions. They are all the same version, running on version 10.0.18.445.
I can load into a singleplayer world fine, but I can't connect to my dedicated server. If I try to join the dedicated server, The client will crash with the following error message:

https://paste.ee/p/LjXbW

I have tried resetting Mekanism's config on both the server and client, and resetting the world on the server side.

Optifine is the problem. Try to update to the newest Optifine version(1.16.5) or remove it.

But the latest 1.16.5 Optifine also causes this crash.