The Key does not exist in Collection

Anyone got any ideas?
Happens on most scenes and is throwing up an in-game error message (sometimes multiple times). Happens on scenes without tokens (just a background image).

I have just moved a stack of image files and spent ages re-directing everything…?

Happens when I load a scene or drag a token onto a scene.

Dunno if this helps?

Does this happen in a single world?
If you make a new one, does it still happen?

Have you tried disabling all modules to see if that could be the issue?
I would also recommend having an ask in Foundry’s discord for help with Foundry.

Appears to have been the ‘multi-level tokens’ mod. Wonder if I have a broken link of a scene somewhere…