Check each item in list problem

I wanted to make an error message pop up after a failed login.I created the system using airtable and on a successful login,the error message pops up for as many non related users in the Airtable database.Is there a way to tell the code to prevent the alert from popping up upon a successful login?I figured it was linked to the check each item in list block but I don’t know how to fix it.

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Very difficult to answer such a general issue. Please show you code so that others can look into the logic and point you to the flaw in it.