I had a similar problem (exact same error message on my keypad when I tried to see thermostat temp) with an HAI RC 80. I went ahead and followed directions by writing a rule which set a set-point (figuring that while I was in elkrp, I might as well write the rules). Just for giggles, I executed the rule. Once I did that, it started working. I guess that for one reason or another, the m1g has to write to the XSP before it can read.