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camera_calibration for monocamera

when I use this commend to calibrate my monocamera , i got the folling problem. Itried to find answer in the internet. but it seems like nobody had ever happend. so please..

 rosrun camera_calibration cameracalibrator.py --size 8x6 --square 0.108 image:=/usb_cam_node/image_raw camera:=/usb_cam_node

Traceback (most recent call last): File "/home/jiaxing/catkin_ws/src/image_pipeline/camera_calibration/nodes/cameracalibrator.py", line 40, in <module> from camera_calibration.camera_calibrator import OpenCVCalibrationNode ImportError: No module named camera_calibration.camera_calibrator

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camera_calibration for monocamera

when I use this commend to calibrate my monocamera , i got the folling problem. Itried to find answer in the internet. but it seems like nobody had ever happend. so please..

 rosrun camera_calibration cameracalibrator.py --size 8x6 --square 0.108 image:=/usb_cam_node/image_raw camera:=/usb_cam_node

Traceback (most recent call last): File "/home/jiaxing/catkin_ws/src/image_pipeline/camera_calibration/nodes/cameracalibrator.py", line 40, in <module> from camera_calibration.camera_calibrator import OpenCVCalibrationNode ImportError: No module named camera_calibration.camera_calibrator

camera_calibration.camera_calibrator