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I used several ROS_INFO, and it came with this error, I don't know what it means.

OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cvtColor, file /tmp/buildd/ros-hydro-opencv2-2.4.9-2precise-20141231-1923/modules/imgproc/src/color.cpp, line 3737 terminate called after throwing an instance of 'cv::Exception' what(): /tmp/buildd/ros-hydro-opencv2-2.4.9-2precise-20141231-1923/modules/imgproc/src/color.cpp:3737: error: (-215) scn == 3 || scn == 4 in function cvtColor

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