What happened?

My friend is unable to join my Aternos minecraft server, we have the exact same mods downloaded with the same versions yet he is unable to join the server but i am.

Whenever he joins he gets instantly kicked and gets this message:

We have both BetterEnd and BetterNether downloaded. The only thing i think conflicts with smithing is another mod we have which is "Additional additions".

BCLib

2.1.5

Fabric API

0.58.0

Fabric Loader

0.14.9

Minecraft

1.19

Relevant log output

No response

Other Mods

Additional Additions
AdventureZ
Appleskin
Cloth Config
JEI (Just Enough Items)
Oh the biomes you'll go refabricated
Philips Ruins
Terrablender