Steps to Reproduce the Bug

Works just Fine in Single Player on 1.21.....But For a server, The server cannot load, and never starts.

Enhanced Mob Spawner filename

spawnermod-1.21.1-1.2.7+Fabric.jar

Other mod filename (Optional)

No response

Extra Notes (Optional)

No response

Could you give more details about this because I'm not able to reproduce your issue. Perhaps a log from your server that never loads?

I am having this same issue the server just does not open here is my log file (i am using the latest version at this time)
latest.log