MCA Selector ‘No Dimensions Found’ Error: Causes and Fixes

ByAdmin

You open MCA Selector, choose File → Open World, pick your world — and instead of a map you get an error saying “No Dimensions found”. The world is fine in Minecraft, so what is the tool complaining about? This is one of the most reported issues on the project’s GitHub tracker (issue #295), and in most cases the cause is simply the folder you selected.

What the error actually means

MCA Selector does not open a world by its name — it reads the folder you give it and looks for dimension data inside it. A Minecraft Java Edition world keeps that data in sub-folders called region and poi (plus entities on newer versions), which sit directly inside the world’s own folder, next to level.dat. If the folder you select does not directly contain a region or poi sub-folder, the tool concludes there are no dimensions to show — because from its point of view, there aren’t.

The usual causes

  • You selected one level too high — for example the saves folder itself, or your whole .minecraft folder, instead of the individual world folder inside saves.
  • You selected one level too low — for example the region folder itself. The tool wants the folder that contains region, not region itself.
  • The save is a Bedrock Edition world. Bedrock stores its world in a LevelDB database, not in .mca region files, so MCA Selector finds no Java dimensions in it. The maintainer has stated there are no plans to support the Bedrock format — see our guide on MCA Selector and Bedrock for what to use instead.
  • A known open bug. Some users have reproduced the error on valid Java worlds (including a 1.21.1 save) even with the right folder selected. Issue #295 is still open upstream, so if the folder checks below all pass, you may be hitting the bug itself rather than a mistake.

Fix it step by step

  1. Close the error and go to File → Open World again.
  2. Navigate into your saves folder and then into the world’s own folder — the one whose name matches the world as it appears in Minecraft’s single-player list.
  3. Before confirming, check the folder’s contents in your file manager: you should see level.dat and sub-folders named region and poi right there. If you see a list of other world folders instead, you are one level too high; if you see only .mca files, you are one level too low (inside region).
  4. Select that folder. The map should now render.
  5. If the folder is correct and it still fails, update MCA Selector to the current version (2.9) and try again — world-format support moves with each release, and older builds can fail on newer saves.
  6. As a sanity check, try opening a different, freshly created Java world. If that one loads, the problem is specific to the first save; if nothing loads, the problem is the installation, not the world.

If it still does not work

Issue #295 remains open on the official tracker at the time of writing, so there is no guaranteed upstream fix yet — the steps above are the workarounds that help most users. If your folder is definitely the world root and you are on the current version, the most useful next step is to add your details (Minecraft version of the world, MCA Selector version, operating system) to that issue on the Querz/mcaselector GitHub repository, since reproducible cases are what moves an open bug forward.

Get the Current Version First

Several of the problems in this guide disappear on the current release. MCA Selector 2.9 is free and open source — get the Windows installer, the cross-platform .jar, the macOS .dmg or the Linux .deb/.rpm from the MCA Selector download page, where every button points at the official GitHub release files with their SHA-256 checksums.

More troubleshooting

This page is part of our MCA Selector troubleshooting hub, which groups every known launch, loading and editing problem by symptom.

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