Which Fuji camera?
Just bought the XE2 raw file and same issue with importing to LR 5.6. I see the thumbnails status bar shows importing but no images come thru then error message "could not copy a file to the requested location". I normally leave them in there root folder. Changed the location to new folder and they imported. Silly
LR didn’t have full permissions to the original import folder you had specified but does to the new one.