When opening a model in Diamonds, you get the error:
The error means that Diamonds is not able to load a used cross-section.
To eliminate the error: try to import the model in BIM Expert. Then export the model again to a new *.bsf-file.
If you don’t have a BIM Expert license, send your *.bsf-file to firstname.lastname@example.org and we’ll do it for you.