[chirp_users] UV 5R with Mac and FTDI cable

I am a newbie trying to program a UV5RV2 using an FTDI cable with a MacBook Pro running 10.7.5. When I go to the Radio pull down menu and select Download from Radio I get a message " could not open port /dev/cu.Subie-SPPDev: [Errno 16] Resource busy: '/dev/cu.Subie-SPPDev' "

The cable shows up in my System Information like this: FT232R USB UART: Product ID: 0x6001 Vendor ID: 0x0403 (Future Technology Devices International Limited) Version: 6.00 Serial Number: A104QONY Speed: Up to 12 Mb/sec Manufacturer: FTDI Location ID: 0x06400000 / 5 Current Available (mA): 500 Current Required (mA): 90

Thank you-