Live View was working but this error has been popping up in the middle of the shoots almost every time.
Likely your camera was disconnected while the software was communicating with the camera and this is causing a communication error.
If error persists, secondary suggestions are:
If not, this is likely a setting on your camera that needs to be updated (disable Face Detection from the camera's menu: turn the AF/M button to AF - you must have an AF capable lens attached to camera. Turn on live view and then advance menu by info button until you see the screen with the icons across the top. Now depress center button of AF/M button and the icon for facial recognition will be seen in yellow. Then rotate front button until norm is seen in yellow area. Finally it is off ! That is a default setting).
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