When trying to connect to my test server I'm getting the following error:

There are no crashes or other weird errors in the console or logs of both the client and server.

I'm using:

• Fabric loader : 0.9.0-build.204
• Fabric API fabric-api-0.16.0+build.384-1.16.1.jar
• DML: deepmoblearning-refabricated-0.1.1-beta.jar
• Kotlin: fabric-language-kotlin-1.3.72+build.1.jar

This even happens when I remove all other mods but the three above from my test server.
If I can help by adding more logs, do let me know.

Thank you for reporting, fixed in 9eb4668. I'll be releasing a new version today with this along with some extra fixes

Thank you!

Its out on curseforge: https://www.curseforge.com/minecraft/mc-mods/deep-mob-learning-refabricated/files/3020893

I can confirm that this bug is fixed. Thanks again!