The system displays this error message if the language you specify in the Text Item property and the NotificationText node does not match.
Proposed solution
Procedure
Add a Text Item node and specify the language you want to use to play the notifications.
You can add multiple Text Item nodes for each language you want to specify.
Select one of the values from the values you specified, as the default language to play the notifications.
POM uses this default language, if either the contact record does not have a language set, or a language exists in the contact record , but notification for the language is not configured in a campaign strategy.