Symptoms
Workflow error: "Column 'K2_Int_SubSiteRelativeUrl' does not belong to table ResultTable." when using Create Site events. The site looks to be created fine, but the workflow halts.
Diagnoses
Likely a version mismatch. Client/server return value is not expected and an exception is thrown.
Resolution
Verify that the App Catalog has the app version that coincides with the server version and that it is pushed to the local site.