Microsoft store upload "Item with the same key has already been added"

Question

I'm attempting to upload an app to the Microsoft store. It is a UWP app built from Visual Studio using the methods described in the official documentation.

When I try to upload the file, I get the error:

Package acceptance validation error: We encountered a fatal error while parsing the package AlgebraCalculatorPreRelease_0.0.0.0_x86.msix: An item with the same key has already been added. Try again or upload a new package.

I have tried rebuilding the project and creating a new submission. I have also run the msix package through the Windows App Certification program (and passed), and the msix installer works fine.

I'm using Windows 10 10.0.19042 and Visual Studio 2019.

Answer 1

Hello,

Welcome to Microsoft Q&A!

Please do not use 0.0.0.0 as your app's version number. Please consider changing the version number to 1.0.0.0 or 0.1.0.0 or other numbers.

Thank you.

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