Symptoms

When trying to access SmartForms in K2 Designer a Server Error was being thrown:

The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040
 

Diagnoses

The error itself was indicative of a mismatched assembly(s) vs the current version of K2.
 

Resolution

Running repairs against both the SmartForms and the control pack resolved this issue.