I'm following this tutorial http://learn.turtlebot.com/2015/02/01/6/.

I'm currently testing my TurtleBot and typed in the following:

roslaunch turtlebot_bringup minimal.launch

I didn't hear the chime after this but don't know why. And then in another window I typed:

roslaunch turtlebot_teleop keyboard_teleop.launch

I know that something's probably wrong when TurtleBot didn't chime but can't figure out why. Here is a picture of the screenshot as to what happened.

Here is a picture of the setup.