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Basic App Troubleshooting - xInvoice
Restarting your device
If you are having problems with the App, try restarting your device first. This can often solve a lot of problems with any App.
Reinstalling the App
If restarting your device doesn't solve the issue; try deleting the App, then download and reinstall the App.
Mke sure you export any data to CSV first and copy to a safe location