This is driving me crazy. I have a lot on this app and now i see this error. unable to open the file
On the screen where your apps are listed, make.powerapps.com next to the app, there is a "...". Click on that and selected details at the bottom of the list. Then choose versions at the top of the details screen. Select an earlier version of your app and again choose the "..." and restore an earlier version. Hopefully, it will work.
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