Opening a K2 form causes an error to be returned stating the Smartobject could not be found.
SmartObject with name [Name] not found. Please rerun the K2 for SharePoint application Registration Wizard as a Site Collection Administrator on the App Catalog. Navigate to Site Contents > K2 for SharePoint > Settings > Registration Wizard.
Try running through the registration wizard as stated in the error message prompt.
If the issue persists, it has been reported that this error can be attributed to a misconfigured people picker control on the form. Please check these controls and other controls on the form.