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ar_pose artoolkit problem

hi all, i'm working with ar_pose package. When i try to run demo:

roslaunch ar_pose demo_single.launch

the demo doesn't run correctly and see this message from terminal.

[ERROR] [1323256898.236396302]: Client [/ar_pose] wants topic /usb_cam/camera_info to have datatype/md5sum [sensor_msgs/CameraInfo/c9a58c1b0b154e0e6da7578cb991d214], but our version has [sensor_msgs/CameraInfo/1b5cf7f984c229b6141ceb3a955aa18f]. Dropping connection. [ERROR] [1323256908.957549386, 1275671534.365555223]: Client [/rviz] wants topic /usb_cam/camera_info to have datatype/md5sum [sensor_msgs/CameraInfo/c9a58c1b0b154e0e6da7578cb991d214], but our version has [sensor_msgs/CameraInfo/1b5cf7f984c229b6141ceb3a955aa18f]. Dropping connection.Dropping connection.