App interface is not showing

friends i need your help. i have Build an app now the app interface donot show when i load the app in app inventor 2 companion it just display blank form none of the component in design interface is showing however all my old app and new once are work fine. any help!

Canned Reply: ABG- Export & Upload .aia)
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Sorry, I can't support extensions.
Please ask your extension vendors.

thank you very much i fund the solution it was extension

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