After this please try the following steps:
1) Please start by closing the application and re-opening it.
2) If the issue persists, please restart your device.
3) Make sure that your device is up to date and that your device is connected to Wi-Fi.
The following steps may cause you to lose your saved data so pleased make sure your device is backed up before doing the next step.
4) After confirming the save data is backed up, delete and reinstall the app.