I had the same error a few years ago but fixed it.
The problem is the CB isn't getting any voltage.
Remove the right panel and locate the Blue 20 pin connector.
Look at this schematic and you will see a LT/GREEN/BLACK wire at pin 2.
http://www.rattlebars.com/valkfaq/schematics/rpage09i.htmlTurn the ignition key on or to ACC.
There should be 12 volts.
On the schematic you will see the 3P MINI WHITE Plug.
Check the voltage on the LT/GREEN/BLACK wire connector. Its a small white plug under the right side panel. If your not getting 12 Volts then there is a short in the 20 pin connector. Just put a jumper wire to bypass the 20 pin connector to the white 3P MINI Plug.