Hi, sorry to re-start this conversation, but I'm having similar problems to Andrew Eversley with regards to creating the visual workflow in the Trailhead Challenge. Can anyone advise where I'm going wrong please?

The error message is: 
caused by element : FlowRecordCreate.Opportunity_Create
caused by: UPSERT --- UPSERT FAILED --- ERRORS : (REQUIRED_FIELD_MISSING) Required fields are missing: [StageName] --- for SFDC record with ID : null,