Can't Launch Server from Custom Modpack

[Shrimpo]

 So i'm creating a modpack and im testing out server creation and I'm getting this weird error that I've never really encountered before:
 

Connection Lost

Internal Exception: io.netty.handler.codec.DecoderException: net.minecraft.ResourceLocationException: Non [a-z0-9/._-] character in path of location:
fm:yellow_cooler@upgrade_aquatic:river_sign-ad_astra:recipes/chiseled_glacio_stone_bricks@byg:dacit

The @ sign in the error is replaced with the word SUB outlined with a square in-game, my guess is this is the problem.

However, I have no idea what it could be, all my libraries and mods were freshly installed. Including passing the exact mods folder from client to server and removing explicit client side mods such as Legendary Tool Tips.
Any help would be appreciated.

Here are some more logs

CLIENT (not the full log): https://hastebin.com/share/oqozadisan.php 

Server: https://hastebin.com/share/gihayaqile.rust

 

[warjort]

Your error is a network protocol error. It typically does not tell you which mod caused the problem.

Those errors are usually caused by

* Mods that were never tested by the mod author in multiplayer

* Mods for different versions of minecraft

 

Usually the only way to find the problem mod is to experiment with removing mods until the problem goes away.

Backup your world before removing mods.