Hi please assist with the error below

"Step not yet complete in My Trailhead Playground 1

There was an unhandled exception. Please reference ID: MRJWLFUH. Error: Restforce::ErrorCode::MalformedQuery. Message: MALFORMED_QUERY: When retrieving results with Metadata or FullName fields, the query qualifications must specify no more than one row for retrieval. Result size: 3"