The 12c configuration might fail with a TRANSFORMBAREEXCEPTION error, if any objects in the catalog are older than Release 11.1.1.7. You can confirm the need to update the catalog items by viewing the metrics in Fusion Middleware Control. In the Catalog folder, find a metric called Reads Needing Upgrade with the description "The number of objects read that required upgrading." If the number is large, then you can resolve this issue by updating objects in the catalog using the Administration page in Presentation Services.