Smart Migration failing

Hi All,

We were getting very close to going live with Smart Migrator to import scanned documents, but I've some how managed to break it. 

The situation is now it doesn't work at all. Any time I attempt to Evaluate -> Migrate documents in Smart Migration the migration fails.

The exception report lists this as the exception:

Migration source object policy not fulfilled - promotion failed (Incorrect function),

I have no idea where to go, I've gone back over my steps the best I can but cannot find what I've done to cause this.

Any ideas on what this means, and how to identify what object policy is my issue?