I can not build my app

I have started to explore "MIT App Inventor" and I created my first app, but now I expanded the app and I try to download the new version.

Now, during the build, I get the message "App inventor can not build this project

Does anybody have an idea why

For lack of specifics, see

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what about providing a screenshot of that message?
are there any details available?


The error message is inconclusive.

Export your .aia file and upload it here.

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