ERROR unable to parse any materials

When I try to compile one of the maps I've been working on I always get this:

Quote:

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processing environment geometry...
### ERROR unable to parse any materials
### ERROR structure import pipeline failed for scenarios\multi\NAME\NAME

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I've tried a large number of different things, but I can't seem to get the map to compile.

Edit: Scratch that, I accidentally linked the frame backwards, my bad.