kml file

If you are importing a mission it is looking for a .mme file type which is our internal file format for the transmission of Map Pilot Pro mission files. 

If you are importing a KML that you intend to create a mission from you would import that from the File Manager screen. Polygons will be imported as mission boundaries that can be used for defining a mission layout and poly line strings will be imported as linear paths. 

Please guide in detail importing from file manager still the same issue

Imported the kml from file manager & also chevked the box
But whatd the next step

Once the file is imported you can either check the box to have it display in the New Mission screen or you can go into the Boundaries section of the File Manager screen where the individual shapes will be shown.