Symptoms
I am in the process of deploying one of our workflows to our Prod. Environment.
I get two errors - The first is the Red exclamation mark, this error I get around by versioning up the smart object.
Following deployment I get the second error.
Dependency could not be created: System exception
Diagnoses
SQL schema changed.
Resolution
SQL schema had changed. Refreshing the service instance appears to have fixed the issue