[1.20.1] Internal Exception: io.netty.handler.codec.DecoderException: io.netty.handler.codec.EncoderException: Java.io.UTFDataFo

I'me making an 1.20.1 minecraft mod, the mod works fine on Intellij in solo but i've exported the mod to test it on a localhost server to see if it works but it dosen't...

Here's the error when i tried to connect to the server :
 

Connection Lost

Internal Exception: io.netty.handler.codec.DecoderException:

io.netty.handler.codec.EncoderException:

Java.io.UTFDataFormatException: malformed input around byte 79

Here's the github link of my mod : https://github.com/Meultirbouchon/ASTRAL-1.20.1/tree/master?tab=readme-ov-file

If you need other files tell me !

Thanks!