The issue is you are utilizing an out of date worksheet. Please download the latest RWDC_DESIGN_KIT from the link below.
In the kit you will find the updated worksheets (wing_definition, V Tail and H Tail), fuselage and material files.
You can enter your values from the old wing_definition worksheet to create the section files. However, more importantly, you can enter the X,Y,Z value for the placement of the Wing (ROOTLE) which will be used in the V Tail and H Tail worksheets.
Please review the Creating Tail Webinar Video - http://apps.ptc.com/schools/RWDC_Support_call-01242012.wmv