@merry flame
You seem to have downgraded your server after starting it in a newer version.
Delete your config/ folder and then do one of these 3 things to fix your world:
- Delete your world
- Upgrade your server back to the original (newer) version
- Use chunker.app to convert it properly
Note: You DO NOT need to delete your world to resolve this issue. Please read what I have said above again.
-# If you need help downloading your world, please let me know!