This mod works well in single mode. However when it comes to multiplayer, other players cannot join the room with this mod. If I remove this mod, other players can join the room, so I think there is something wrong in this mod.

Error:
Internal Exception: io.netty.handler.codec.EncoderException: io.netty.util.IllegalReferenceCountException: refCnt:0

For any bug reports please provide the following details as well,

• MC Version:1.17
• C&B Version:1.1.39/1.1.41
• Do You have Optifine:Yes

Logs from both the server and the client please

ClientLog-minecraft-exported-logs-2021-10-29T16-07-53.log
ServerLog-minecraft-exported-logs-2021-10-29T16-08-31.log
Both two logs are uploaded. The client tried to log in twice and each time error occured.

In addition, there is only one mod, which is this mod, is added, so the problem is not about compatibility with other mods. The information that each time client tries to connect and gets lost may be a bit different, but you can see from the server log, the exceptions are the same: Internal Exception: io.netty.handler.codec.EncoderException: io.netty.util.IllegalReferenceCountException: refCnt:0. Another mod(CosmeticArmorReworked) also has the same problem and I also reported to the author. I think the problem is related to the interface. I know very few about programming and modding, so I cannot figure it out. Anyway, thank you and other authors for creating and continue maintaining this fancy mod! I like it.

You are using a cracked or invalid client.
Closing and locking the issue