✗ robot convert -I http://purl.obolibrary.org/obo/ro.owl -o z.owl
org.semanticweb.owlapi.model.UnloadableImportException: Could not load imported ontology: <http://purl.obolibrary.org/obo/ro/omo_import.owl> Cause: https://raw.githubusercontent.com/oborel/obo-relations/master/omo_import.owl
Use the -vvv option to show the stack trace.
Use the --help option to see usage information.