TurtleBot Calibration -- continuous stream of warnings and errors

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I am running the turtlebot calibration procedure for my turtlebot and I am getting a long list of scrolling errors and process restarts when I run the command:

roslaunch turtlebot_calibration calibrate.launch

I have run this before and it has worked, but now I am getting a long stream of the following. I also have a weird error that when I run any ros packages the green power light on the create turns off... but it runs anyway (such as teleop or calibrate). Namely the light turns off, the diagnostic pane says power system error, but the breaker is lit up green and the dashboard shows it to be in full mode and it responds to keyboard commands. The error I get when running calibrate.launch is below:

... logging to /home/turtlebot/.ros/log/4dd2b4ee-d4b2-11e0-89cd-485d607f80f5/roslaunch-turtlebot-laptop-600.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://192.168.11.59:33068/

SUMMARY
========

PARAMETERS
 * /openni_camera/depth_time_offset
 * /openni_camera/image_mode
 * /kinect_laser/output_frame_id
 * /openni_camera/depth_rgb_translation
 * /pointcloud_throttle/max_rate
 * /openni_camera/depth_mode
 * /openni_camera/shift_offset
 * /scan_to_angle/min_angle
 * /kinect_laser/min_height
 * /openni_camera/depth_rgb_rotation
 * /kinect_laser_narrow/max_height
 * /scan_to_angle/max_angle
 * /kinect_laser/max_height
 * /rosdistro
 * /openni_camera/projector_depth_baseline
 * /kinect_laser_narrow/output_frame_id
 * /rosversion
 * /openni_camera/debayering
 * /openni_camera/depth_frame_id
 * /openni_camera/image_time_offset
 * /openni_camera/depth_registration
 * /kinect_laser_narrow/min_height
 * /openni_camera/rgb_frame_id

NODES
  /
    kinect_breaker_enabler (turtlebot_node/kinect_breaker_enabler.py)
    openni_manager (nodelet/nodelet)
    openni_camera (nodelet/nodelet)
    pointcloud_throttle (nodelet/nodelet)
    kinect_laser (nodelet/nodelet)
    kinect_laser_narrow (nodelet/nodelet)
    scan_to_angle (turtlebot_calibration/scan_to_angle.py)
    turtlebot_calibration (turtlebot_calibration/calibrate.py)

ROS_MASTER_URI=http://192.168.11.59:11311

core service [/rosout] found
process[kinect_breaker_enabler-1]: started with pid [745]
process[openni_manager-2]: started with pid [752]
process[openni_camera-3]: started with pid [760]
process[pointcloud_throttle-4]: started with pid [767]
process[kinect_laser-5]: started with pid [773]
process[kinect_laser_narrow-6]: started with pid [785]
process[scan_to_angle-7]: started with pid [802]
process[turtlebot_calibration-8]: started with pid [810]
Caught exception while logging: [Cannot use ros::Time::now() before the first NodeHandle has been created or ros::start() has been called.  If this is a standalone app or test that just uses ros::Time and does not communicate over ROS, you may also call ros::Time::init()]
Caught exception while logging: [Cannot use ros::Time::now() before the first NodeHandle has been created or ros::start() has been called.  If this is a standalone app or test that just uses ros::Time and does not communicate over ROS, you may also call ros::Time::init()]
[pointcloud_throttle-4] process has finished cleanly.
log file: /home/turtlebot/.ros/log/4dd2b4ee-d4b2-11e0-89cd-485d607f80f5/pointcloud_throttle-4*.log
respawning...
[pointcloud_throttle-4] restarting process
process[pointcloud_throttle-4]: started with pid [1057]
[ INFO] [1314893216.963954647]: [/openni_camera] No devices connected.... waiting for devices to be connected
[INFO] [WallTime: 1314893217.065955] Estimating imu drift
[INFO] [WallTime: 1314893217.367307] Still waiting for imu
[pointcloud_throttle-4] process has finished cleanly.
log file: /home/turtlebot/.ros/log/4dd2b4ee-d4b2-11e0-89cd-485d607f80f5/pointcloud_throttle-4*.log
respawning...
[pointcloud_throttle-4] restarting process
process[pointcloud_throttle-4]: started with pid [1165]
[INFO] [WallTime: 1314893217.669826] Still waiting for imu
[INFO] [WallTime: 1314893217.971408] Still waiting for imu
[ INFO] [1314893217.972921728]: [/openni_camera] No devices connected.... waiting for devices ...