When I try to add a sidewall diffuser to the end of the duct it doesnt work. I get an error saying "Can't make type "Rectangular Duct Transition : 45 Degree" "and another saying element is reversed. this forces me to erase the duct work and the diffuser is then located at an offset of 112 feet. I am using the OOTB part and the OOTB template. Any ideas why this is happening.