In the export folder, you would find the Dgraph Schema g01.schema.gz. Please use this as the schema file. You can ignore the GraphQL schema for bulk loading purposes.
Instead of :
dgraph bulk -f /data/g01.rdf.gz -s /data/g01.gql_schema
please try :
dgraph bulk -f /data/g01.rdf.gz -s /data/g01.schema