: The local backend application engine failed to initialize properly.

Open the ExpressVPN app, disconnect, and connect to a different city or country. 2. Use Different VPN Protocols

After investigating various user reports and feedback, we've identified some common causes of the "Just a Moment" error on ExpressVPN:

Corrupted local configuration files can trap the application in a boot loop. Close the ExpressVPN app completely.

Sometimes the VPN app loses track of its own status.