Got it to upload
...when you open your Project, do you see a message similar to this:
"An internal error has occurred. Report a bug?"
The Blocks work area for the BuyAndViewShopItems is empty and the App Inventor display of the in-work-area items like the bin, zoom btns etc are all in the top-left corner. This does somehow iron itself out but, well, more than disconcerting. The warnings on two Blocks are also wrong, though this is a known problem and nothing to do with the main fault.
Is this the "bad" version of your project or the "fixed" version? Either way, it might well be safer to start a new project from scratch.
I notice that there is a lot of discussion about the Custom Dialog extension. Ensure you have the latest version. Developed for Kodular, it might not be 100% compatible with App Inventor.