Show alert massage when start my apps

Hi
I create apps Using google sheet,
When I start my apps 1st show alert "End application "
But if I wait 30 to 60 second and click blank side on this page then hide Alert Massage and apps work properly.

What can I do now?

Show your relevant blocks - especially your Screen1.Initialise. You are creating a list without content, this is causing the error.

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