Trouble making the mod work with Fabric

[TovMachin]

Hey,

I recently changed from a Forge modpack to a Fabric one.
The mod worked fine with forge but I have trouble getting it to work with fabric.

Essential Mod : essential_1-3-1-1_fabric_1-20-1.jar 49.8MB
ECU : ecu-1.3.0.jar
Fabric version : 0.15.9 for MC 1.20.1

• The modpack I play is a custom one made using CurseForge

Is there anything I'm missing ?

Edit: Tried downgrading to Essentials 1.3.0.3 (version released before Last Checked for 1.20.1) still doesn't work

[OM3GA6400]

same

[dxxxxy]

My apologies for the super late reply, I was not able to replicate the issue using your exact parameters. Used the Fabric 1.20.1 installer downloaded from https://essential.gg/downloads to then relaunch with the installer replaced by the mod itself (50MB) taken from the .minecraft/essential folder.