Mac or Windows? What version?
What exact version NUMBER of Lightroom are you using?
If you are directly connecting your camera to the computer, in the long run you will be happier with a card reader. Card readers require no special drivers, are less error prone, give faster transfers, and do not drain the camera's battery.
Thank you for your response. I figured out the problem and it was just updating my Mac software, which I thought was already up to date. Per your suggest, I will start using a card reader because I think that will be the better option in the long run.