A. Ensure that your iPhone is running the latest version of iOS. Go to Settings > General > Software Update to check for updates. Keeping your device updated can resolve compatibility issues.

B. Try uninstalling and reinstalling the app. This can clear any corrupted data that may have been introduced during the update process. To do this, press and hold the app icon until it wiggles, then tap the 'X' to delete it. Reinstall it from the App Store.