After attempting to connect RDC to C650GT, GS911 says: no controller

[Elwin]

Hello,

I've successfully learned a new RDS sensor for my rear wheel, after replacing the battery, using a TMPS activator and GS911.

Attempting the same on the front wheel, I couldn't get the sensor to connect.

I don't remember exactly what I might have done to cause this, but on the next attempt, GS911 said there was no controller to connect to

And now my bike displays both currently mounted, and previously working, RDC's as dead.

Please help - thank you.