Symptoms
Smartforms are generating errors: SetProperty Label was not found. When debugging a performance issue, I noticed an error (SetProperty Label was not found) repeating hundreds of times in the smartforms debug log. I found a post regarding this in the K2 community site (http://community.k2.com/t5/K2-blackpearl/K2-Smartforms-smartforms-are-generating-errors-SetProperty-Label/ta-p/83906)
Diagnoses
This is a known issue, and has been linked to existing TFS item for the developer team.
Resolution
There is not a fix currently available as the error messages should be benign. This should be addressed in a future release.