Mavlink logging failed

I am connecting to an Iris with a MacBook Pro using a 3DR 915 radio. I have loaded the required USB driver. As soon as I hit connect I get the message that Mavlink logging has failed. All other functions seem to work fine. I saw the file options in setup, but could not find the right combination to make this work. Any help would be appreciated. Thank you.

can you post a screen capture and the app log from ~/apmplanner2 directory