Invalid alert type. (Code: 17004)

I am getting the following Error [ Invalid alert type. (Code: 17004) ] when attempting removing emails from the notification section. Can you tell me why I am getting this Error? Please advise.

Thank you

Hello this error is still persistent and I would like to remove two contact emails from the notification settings. please let me know how I can bypass the following error.
Invalid alert type. (Code: 17004)

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