Inspect the account settings to see whether they are correct.
1. Make sure you have the newest version of the app on your device. Check for updates and download them, if you need.
2. Ensure network stability. Maybe you experienced a little network glitch at the time of connecting. Make sure that your Internet connection is stable and try again.
3. Validate your password by logging in with it on our website. If you forgot the password, change it, log in on your device and try connecting.