Symptoms
Generating a SmartObject from the smartobject administration pages throws an error:
Exception of type 'System.Web.HttpUnhandledException' was thrown. extender control'[GUID]' is not a registered extender control. Extender controls must be registered using RegisterExtenderControl() before calling RegisterScripDescriptors(). Parameter name: extenderControl.
Diagnoses
n/a
Resolution
A coldfix must be applied, for this contact K2 support.