How to Create a pop up window if the user inputs wrong information?

Hi guys, I have two fields for the user to input text, and I want an error to pop up on the screen if the user leaves both of the text fields blank. Is there any way to do this?

:clap: Welcome to the Community!:clap:

I made a cloneable app for you, just clone the app and you could see what I did!

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Thank you!! This is a huge help!

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Brilliant!!! :clap: :trophy:

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Can you give me the new link? That link is no longer avaliable.

Please give me the new link
That link is no longer available

Please, I need what @jakmalo needed too

Hi, @James_App_Maker. Could you please make a new link, the old one doesn’t work :expressionless: