Hi Jared.
Any update on this issue? I have a Canon 6D as well and I am getting the same error message.
I have tried checking and un-checking the "Use Camera ISO" option in the SGPro Config in PemPro but that doesn't seem to make any difference. I am able to "Take One" from the frame and focus module in SGP so I know that camera is connected and able to take an image. Any help you can offer would be appreciated.
Andrew J