Players cannot connect to the server. Without this addon, the server starts. https://pastebin.com/drs8fhmp
Internal Exception: io.netty.handler.codec.EncoderException: net.minecraftforge.fml.util.ObfuscationReflectionHelper$UnableToFindFieldException: java.lang.NoSuchFieldException: field_186466_c

Pastebin says that the log you attached is private or pending moderation. Uploading it to a similar site or adjusting privacy settings should fix that so I can view it. I'll try and recreate the issue on my side soon for debugging.

https://disk.yandex.ru/d/-olVSm3nZLFD4g
Apologize. Here is the link to download txt. If necessary, I can send my entire server and mods from the client (so that you don't download everything separately)

I believe this has been fixed in 6ce6d7f, but I'll leave the issue open until I've published a new version to CurseForge for you to test.

Thanks, everything works now