It sometimes happens when opening an app that a "Oops?!" error message appear.
First of all, make sure this app and your OS are up-to-date. Go to 'App Libraries' and check if the app needs an update. If it needs one, it should have an "Upgrade" sign on its icon. Keep in mind it's essential to always have all apps and OS up-to-date.
Secondly, follow those steps separately:
- Maintain click on the app icon (on the homescreen) and select "turn off app". Then click again on the app icon to turn it back on. Try opening the app again.
- Try rebooting your Prota. Go to Settings app and click on the "Reboot" button.
- Ultimately, resetting your Prota will fix this issue. Follow this article to reset your Prota S.