Hi Donna!
I have the same error on mine, I took off the cover of it and saw a broken plastic wheel. That wheel is inserted on the right side on the roller bar that holds the belt and it passes between two points holded by the speed sensor. I will try to repair it with some dry fast glue but I'm not sure if it will work. I'm not also sure what is the part number/name of that plastic wheel so I can replace it. I'll search for it and will let you know if I success.
Carlos
PS.-if you are going to take a look, don't forget to unplug it!
Carlos, June 2009
