I am trying to migrate the Ontology for Biomedical Investigations (OBI) (https://github.com/obi-ontology/obi/blob/master/obi.owl) from OWL to Grakn, but I get an arity mismatch error:
Brams-MacBook-Pro:obi bram$ /Applications/grakn/bin/migration.sh owl -k "obi" -i obi.owl
Migrating data /path/to/obi/obi.owl using Grakn Engine localhost:4567 into graph obi
Arity mismatch when creating rule
The error message is pretty sparse so I was wondering what might cause the error and how I would go about resolving it. For instance, if it is caused by an inconsistency in the OWL file, what should I be looking for?