I am trying to add a Celestron f/6.3 Reducer-Corrector and a 2X Barlow to my equipment list and when I go into Scope, I get a message Invalid Equipment Combination. I have added my Plossi 40, X-Cel 9 and DeLIte 13 and they all work. I have a Celstron Nexstar Evolution 8 added to my equipment list.