What does this mean? And how do I fix it?
This looks like an error arising from incorrect download of your app files(ccz). If you are doing offline installation using the ccz file, can you re-download the ccz file and try reinstalling your app. If you are using any of the online installation methods (Barcode scan or app code install), can you simply retry installing your app. If you still face this issue, would you be able to report a bug so that we can take a deeper look at this.
Thanks Shubham, I tried reinstalling using the qr code and it worked!