Error export from .apk

I am having the following error when trying to export to .apk
I analyzed all the blocks and there is no duplicate declaration of 'back' command

Version of my App Inventor is 2.64.1 (build 9)

Below is the project and the error image

Projeto_Luiza (2).aia (816.7 KB)

That error message hints that you have a button named 'back' in that last screen mentioned in that log.

The latest release of AI2 introduced a bug making it sensitive to certain component names like 'back'..

Search your screens for such buttons (or other components), and rename them in the Designer to include component type in the name, like btnBack.

I couldn't find the button mentioned in the error, so I decided to erase the screen and redo it.

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