If your cadence sensor is paired to the Wahoo Fitness app and you are getting a proper signal but no cadence reading, you might need to make a simple settings adjustment.
To make this adjustment:
1) Open the Wahoo Fitness App
2) Select Settings
3) Select the correct workout profile (probably Indoor Bike Trainer)
4) Select Data Sources
5) Make sure that speed and distance are set to pull from the KICKR and make sure that cadence is set to pull from your cadence sensor