That's not really an "error" as such. Similar log notes like that appear in every one of my logs as well.
If you are having an issue with communicating with your camera make sure that your usb cables and any hubs are working properly. How is the camera connected to the computer? Through a hub? If something is causing a loss of communication with the camera that's probably not a SGP problem.
Can you post the full log via dropbox or something like that?