DESCRIPTION
You may get this error from an email alert which is being fired from Flow. This error takes place when there is no recipient when Email Alert is running. In below email alert, imagine of field “Email” is blank! Yes, it will throw this error.
SOLUTION
While calling this email alert in flow, specifically check whether recipient is not blank. In given example, Email should be checked, if it is not blank then Email Alert should be invoked.
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