sony nx5U to fcp 7 won't log and transfer?

I am trying to log and transfer clips I shot on the 128 gig external drive of my nx5u to fcp 7 project , but when I use USB connect on the camera, it won't connect to the external drive to access the clips, only gives me ability for flash drives A & B??? If I click log and transfer in project, I keep getting error message "yeltsinmandela" contains unsupported media or has an invalid directory structure. Please choose a folder whose directory structure matches supported media. The first time I hooked it up, it worked fine, what am I doing wrong this time??? Any ideas are greatly appreciated.

Paul Evans
wildnewmexico.com