problem in transfering 3D model from gambit to fluent.
 

I am facing a problem in transferring a 3d model of rectangular duct from gambit to fluent.
error shown " At least one geometry entity has no mesh for export. You can use the unmeshed filter in the geometry summarize picker to find the unmeshed entities"

How can i solve this problem??

You model might have stand-alone vertice or edge. Also check for duplicate edges and faces.