[chirp_users] Chirp not communicating

[Verne Brown]

Using Macbook Pro with OS 10.10.5 (Yosemite)Chirp 0.4.1Radio - 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 occurredcould 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.
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