Error message:

Version installed 1.21.6
Version requiered 1.21.6~

The game couldn't start even if the right version was installed.

In the file "fabric.mod,json" on line 37 it was written : ' "minecraft": " ~1.21.6~" '.

Changed it to "~1.21.6" and the game was able to start.

Where did you find "fabric.mod.json" file?

Where did you find "fabric.mod.json" file?

I don't know if it's a good thing to do. The mod that needed architectury isn't available yet on this version so I wasn't able to test it.

But if you want to try (on windows) put the mod in a new folder (to avoid losing files), change the extension from .jar to .zip then extract it.

You will have the source files.

You can open the file "fabric.mod.json" with a code editor (I used vscode) and edit the line 37 as I did.

After that you can take all the files and folders and compress them in .zip (be carefull to not select the .zip you previously unzip).

Then your game should start.

If you're not comfortable doing all that. You can just wait, it should be patched soon if it indeed is a typo.

You can also just use a dependency override instead of having to edit the file inside the JAR. Add this to your config folder and it should start.

fabric_loader_dependencies.json