Missing Dimension
The world references a dimension type that the server cannot find. A datapack or mod that added a custom dimension is missing or misconfigured, so that dimension fails to load.
What does this error mean?
Dimensions are defined by a 'dimension type' (often from a mod or datapack). 'Dimension type not found' means the world expects a dimension whose definition is absent, commonly after removing the mod/datapack that provided it.
Dimension type not found
Most Common Causes
- A dimension mod/datapack removed while the world still references it.
- A malformed dimension type definition.
- A namespace mismatch in the dimension id.
- A version mismatch in dimension format.
- A partially installed datapack.
How To Diagnose
- Read the log for the missing dimension id/namespace.
- Find which mod/datapack should provide it.
- Check whether that provider was recently removed.
- Validate the dimension JSON if custom.
Recommended Fixes
- Reinstall the provider
Add back the mod or datapack that defines the dimension. - Fix the definition
Correct the dimension type JSON or its namespace. - Migrate before removing
When removing a dimension mod, move players out and clear references first. - Restore from backup
Roll back to before the dimension provider was removed.
Frequently Asked Questions
The world still references its dimension. Without the definition, that dimension cannot load.
In datapacks/mods under data/<namespace>/dimension and dimension_type.
Reinstall the provider, move them to the overworld, then remove it cleanly.