I try to start a piping route by dragging and dropping a 20" slip on weld flange.  After the flange is assembled, a dialogue box immediately pops up saying

"No matching configurations are available for elbow 'piping\elbows\90 degrees\90deg Ir inch elbow.sldprt'. Please customize the template and see all available configurations."

So basically it's saying there is not a 20" elbow?  Where is the template that I need to customize?  Is it talking about the Design Table for the elbow?  What do I do?