"Action not found" error message appears on subform when it opens

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Issue

The following error message appears on a subform when it opens:

Action not found

Symptoms

This error message can appear on a form or subform.

Resolution

To resolve this, review the form/subform rules and look for "Action Worklist Item" actions within the form initialize/initialized rules.
This error message normally appears when there is no action specified in the "Action Worklist Item" rule actions, or when a non-existing/non-defined action is specified there.

In cases where this error appears on subform level, it may be necessary to review initialize/initialized rules defined on the main form level.