crash on creating

[ahmadmhbanaii-dot]

Minecraft version

1.21.1

Describe the bug

crashing on creating server

Steps to reproduce

1. Creating a server on Cisco's Fantasy Medieval RPG [Dragonfyre] version 1.20.1
2. it's giving me report and i'm sending it to Minecraft nothing has been done about it

...

Logs

No response

Additional context

No response