Yes, attached in a minimal 4.16 project. If you open it in 4.16, the BP compiles file. Migrate to 4.17 and you’ll see the exact error pictured.Repro
After migrating, open BP_Clock in DynamicClocks\Blueprints. You’ll see compile fails - the first error takes you to the error pictured in my first post. If you then add another pin to the HandsRotation BP structure, it starts working again.
Regards,
-Brian.