Describe the issue
When starting a server with ETF or EMF installed, the server crashes.
While there is no need to run these mods on a server, they still should not cause a crash whenever possible.
It happens all the time that modpack authors include these mods in their server files or users copy over the mods folder from their client to the server. According to the forge documentation one-sided mods should still work on the incorrect side.

Basically, if your mod is loaded on the wrong side, it should simply do nothing, listen to no events, and so on.

To my understanding you could just remove the line that throws the exception in the Forge and NeoForge version and it would solve the issue.

Crash log

Log: https://mclo.gs/eDix5Nx
Crash Report: https://mclo.gs/GOqekbl

Your setup: (please complete the following information):

• Minecraft version: 1.20.4 (affects all versions)
• ModLoader: NeoForge (also affects Forge)
• ETF Version 6.0.1
• Does the issue persist with only ETF installed? Yes
• Have you checked the FAQ in the Readme, or Discord, to see if it is a known issue? Yes