We apologize for the inconvenience. Please try again with your device connected to the internet. If that does not help, restart your device and try once more.
In rare cases, it still does not work. In that case, please reinstall the app in a way that keeps your data, as follows.
Open the Settings app, tap General, then iPhone Storage, select this app, and tap Offload App.
This removes the app while keeping its data.
After that, search for this app on the App Store, install it again, and check. Thank you.