Paired devices

I subscribed to Zwift last winter, used it a few times and then not at all during the warmer period. Now, having tried to ride this morning, the system is insisting that I pair two devices, “power source” and “speed sensor”, which I do not have. So I can not use the system at all. Very frustrating to say the least. Any ideas how this can be fixed please?

You choose one or the other and then you will go to the next pairing screen for the rest.