(note this is usually a very rare occurrence)
1. Check table DWH_INTERNAL_MD on the DWH database for any records.
2. If you have results there ask the DBA to copy all the CREATE statements, modify the schema to the correct one, and then run them again DWH.
3. Once the objects are all created, truncate DWH_INTERNAL_MD
4. Re-run Load Data Warehouse - Full - this will complete successfully.