I need help on how to do a flow simulation of a blower with solidworks

I designed a blower that I would like to simulate to see the CFM etc, but for some reason after I create lids and try to set up boundries for the inlet and outlet, it tells me that they are out of constaint. I have produces a part and disabled it around the impeller/Radial fan but I still cannot get it right. I am new to solidworks, and do most of my designs on Solidedge.