If the app gives you an unexpected error, you may need to reinstall your ExpressVPN configuration. This guide shows you how to reinstall your ExpressVPN configuration.
Open the app and tap Options.
Tap Settings > Reinstall VPN Configuration.
A notification will pop up. Tap Allow.
The app will notify you: ‘ “ExpressVPN” Would Like to Add VPN Configurations.’ Tap Allow to continue.
Use your Touch ID or enter your passcode to add the VPN configurations.
Your VPN configuration will be reinstalled.