Im using aternos to start a server, and these are the mods.

and here is the log-

https://mclo.gs/Eqdbc6b

any help?

Seems like at least one of your mods is outdated (Depends on an outdated version of Artifice).
All you can do really is remove mods one by one until it is fixed and then check if there's a newer version of that mod.

update: i dont know why it says the server is vanilla, but yes it is fabric

Seems like at least one of your mods is outdated (Depends on an outdated version of Artifice).
All you can do really is remove mods one by one until it is fixed and then check if there's a newer version of that mod.

damn, okay ill go with that i guess

Can someone please close this, as it is not a fabric-api problem ?

Closing, if this is still an issue please make a new issue.