A. 1. Restart the app: Close WienMobil completely and reopen it to see if the error persists.
2. Clear app cache: Go to 'Settings' > 'General' > 'iPhone Storage', find WienMobil, and select 'Offload App' to clear cache without deleting data.
B. 3. Reinstall the app: If the error continues, delete the app and reinstall it from the App Store.