The steps below corrected the sensor error for me
1. Login to your Acu-link account
2. You should see your sensor data and a box at the upper right of the screen with your email address. Click on the box
3. You should see a drop down with a "Follow My Friends Bridge". Click on it
4. You should see bridges with a red X next to them. Remove them and exit this window
5. Restart the app. All my data started displaying again
jjjwww676767 about Acu-Link