On my Aternos server I can't press "E" to open my inventory. Whenever I do I get kicked. This is in every gamemode and here is the crash message:

The game crashed whilst unexpected error
Error: java.lang.NullPointerException: Registry Object not present: sophisticatedbackpacks:smithing_upgrade

Does anyone know how to fix this. I also use alot of other mods too so maybe they are the problem.

have you got the same version of SB on the server / client? Is there more detail for that exception in the log?

have you got the same version of SB on the server / client? Is there more detail for that exception in the log?

I do not know to where the crash code is usefull to, so there is a bit of it.

java.lang.NullPointerException: Registry Object not present: sophisticatedbackpacks:smithing_upgrade
at net.minecraftforge.registries.RegistryObject.get(RegistryObject.java:572) ~[forge-1.20.1-47.3.0-universal.jar%23273!/:?] {re:mixin,re:classloading,pl:mixin:APP:modernfix-forge.mixins.json:perf.forge_registry_lambda.RegistryObjectMixin from mod modernfix,pl:mixin:A}
at net.p3pp3rf1y.sophisticatedbackpacks.init.ModItems.lambda$static$47(ModItems.java:255) ~[sophisticatedbackpacks-1.20.1-3.21.1.1161.jar%23253!/:1.20.1-3.21.1.1161]

btw yes i have the same versions

I have somehow managed to fix it. I just reinstalled it (again) and now it works. Still thanks for trying to help