Using Macbook Pro with OS 10.10.5 (Yosemite)

Chirp 0.4.1

Radio - Baofeng UV-5R

I've been successful using older mac os' in communicating to this radio in the past

I try to download the radio's program i get this error message 

"An error had occurred

could not open port /dev/cu.vernebrownscomputer-Blu:[Ermo 16]

resource busy : '/dev/cu.vernebrownscomputer-Blu'

Not sure what I'm doing wrong or forgot to do.  

did the cable check - it recognizes the type of chip in the cable as the debug instructions.