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From my experiences, this issue is easily fixed. You ready: restart the robot. If that doesn't work, do this:
roscd turtlebot_bringup
sudo ./[scripts, maybe?]/install.bash <Network interface, probably wlan0>
Then, restart. If that doesn't work, charge your turtlebot.
This happens every once and a while to me as well. I normally play with it until it works. Best of luck, -Hunter A.