Customize Alert Message

Hi Everyone,

I am doing the customize alert message, when I select the submit button without selecting any choice.The alert message is appearing, that is working fine but when I select any choice then click the submit button, the alert message is appearing in the first attempt that is incorrect. The alert message should not appear in the first attempt. I have given the two attempt for the user.

Please help me if anyone is there. I have attached the question slide with this message.

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