I see the following message when using the Lingo app: Biosensor Error What it may mean: The Lingo Biosensor is unable to provide a reading. Tap the (?) symbol for more information. What to do: Check again after the duration specified in the message. Need help? Please submit your request here. Related articles I see the following message when using the Lingo app: Replace Biosensor How do I apply and activate my biosensor? What if my biosensor becomes loose? What if my biosensor comes off too soon? What Bluetooth radio frequency does my biosensor use?