Hi,
I have a problem with calibrating the trainer. When I turn on the Tacx or Zwift app, the apps connect to the trainer, show data (speed, power etc.) but I cannot calibrate the trainer. It shows an error all the time. 

Hi,
I have a problem with calibrating the trainer. When I turn on the Tacx or Zwift app, the apps connect to the trainer, show data (speed, power etc.) but I cannot calibrate the trainer. It shows an error all the time. 

I once had a similar error message when I tried to "calibrate" the trainer first up without a warm-up (ie warm up of the trainer), did 10 minutes free ride with 1% grade and it then calibrated ok.
The other usual issues of correct range tire pressure, latest trainer & Tacx App software don't seem to be relevant in this.