Symptoms

Smartobject Event execution of a Create method errors with:

Item not found in this collection.
 

Diagnoses

We noticed in that the process Smartobject Event configuration, there was an additional Input property that was not present in the Smartobject when executing from the Smartobject Service Tester tool.
 

Resolution

We updated and redeployed the Smartobject's method to include this property which resolved the issue.