Turtlebot calibration(Still waiting for imu/scan)

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When I type "roslaunch turtlebot_calibration calibrate.launch", the terminal shows

[INFO] [WallTime: 1308820084.864965] Estimating imu drift
[INFO] [WallTime: 1308820085.165909] Still waiting for imu
[INFO] [WallTime: 1308820085.466922] Still waiting for imu
[INFO] [WallTime: 1308820085.767989] Still waiting for imu

Eariler on, it showed

[INFO] [WallTime: 1308820084.864965] Estimating imu drift
[INFO] [WallTime: 1308820085.165909] Still waiting for scan
[INFO] [WallTime: 1308820085.466922] Still waiting for scan
[INFO] [WallTime: 1308820085.767989] Still waiting for scan

Does anybody know what these two messages might suggest? I can't understand the code.

Extra info:

-Using a bumblebee2 camera instead of a kinect

-I am using a MicroStrain 3DM-GX2 IMU for turtlebot, I changed the frame_id to gyro_link and the remapped the topic "imu/data" robot_pose_ekf subscribes to to "bumblebee2/bumblebee2/imu/data" so that the imu messages can reach robot_pose_ekf. Despite doing this, I'm not sure if the gyro is working properly as I still get "Bad Gyro Calibration" under diagnosis

Let me know if you require and extra information, I'm not too sure what is relevant. Thanks in advance!