Dedicated 1.20.1 server crashes when attempting to start up.
loader: forge 47.3.5

Reason given is:

[10:41:53] [main/ERROR] [minecraft/Main]: Failed to start the minecraft server
net.minecraftforge.fml.LoadingFailedException: Loading errors encountered: [
Mod §equark§r requires §6zeta§r §o1.0-20 or above, and below 2.0§r
§7Currently, §6zeta§r§7 is §o1.0-19
]

I could be mistaken, but that's telling you that you have the wrong version of Zeta installed.

Update zeta