Symptoms

A view was created without binding any smartobject. Now I want to bind a smart object to it, I got the error message below after clicking Finish button to save the change:

Specified argument was out of the range of valid values. Parameter name: candidate

 

Diagnoses

This is because a control/controls on the View in question are currently bound to a SmartObject data-source(even though the View itself is not bound to any SmartObject).
 

Resolution

This is a known issue in previous version of SmartForms that has been fixed in the latest 4.6.9 release.