If you receive error 400 or 401 when opening the app or creating a profile, try clearing app data for Jack'd in your device's settings:

1. Locate the Jack'd app icon on your home screen.
2. Tap and hold the icon.
3. Select App info from the context menu that appears.
4. Then tap Storage then tap Clear storage or Clear data.

NOTE: Uninstalling and reinstalling the app will not resolve this issue. 

After clearing the data, try opening Jack'd and logging in or creating a profile again. Submit a support request if clearing app data does not resolve this issue.