Modded 1.18.1: client can´t connect to server

[Squalll94]

Hi together,

 

so it seems like I can´t connect to my friend´s lan party.

This is the crucial part of the crash log:

 

Thanks in advance.

 

[00:19:45] [Render thread/INFO]: Started serving on 57307
[00:19:45] [Render thread/INFO]: [CHAT] Local game hosted on port 57307
[00:20:01] [User Authenticator #2/INFO]: UUID of player Squalll94 is XXXXXX
[00:20:01] [Server thread/INFO]: Squalll94[/XXXXXXXX] logged in with entity id 2664 at (119.5, 149.0, 7.5)
[00:20:01] [Server thread/INFO]: Squalll94 joined the game
[00:20:01] [Render thread/INFO]: [CHAT] Squalll94 joined the game
[00:20:01] [Netty Server IO #7/ERROR]: java.lang.NullPointerException: Cannot invoke "net.minecraft.class_2960.toString()" because "$$0" is null
[00:20:01] [Netty Server IO #7/ERROR]: Could not serialize INSTANCE (class com.blamejared.crafttweaker.api.command.argument.CTRecipeTypeArgument) - will not be sent to client!
[00:20:01] [Server thread/INFO]: Squalll94 lost connection: Internal Exception: io.netty.handler.codec.EncoderException: java.lang.NullPointerException: Cannot invoke "net.minecraft.class_2960.toString()" because "$$0" is null
[00:20:01] [Server thread/INFO]: Squalll94 left the game
[00:20:01] [Render thread/INFO]: [CHAT] Squalll94 left the game