Trying to print onto a LightScribe CD with my Canon MG6200, the message "There is no disc tray. Set the tray & select OK" comes up despite there being a tray, with a disc in place,which is being moved into and out of the printer when inserted and P pressed.
I had a similar problem recently with my Canon; it kept telling me that the paper delivery tray was closed, the lying bounder. I'd had it a few years so I bought a new one for £40.
I was trying to print on a LightScribe disk using an ordinary printer, wehreas you need a LightScribe CD drive to work its' magic on the light sensitive layer.
Michael Corgan 