OpenCV(3.4.1) Error: Assertion failed (scn == 1 && (dcn == 3 || dcn == 4)) in c报错,求助贴

  OpenCV(3.4.1) Error: Assertion failed (scn == 1 && (dcn == 3 || dcn == 4)) in cv::cvtColor, file C:\build\master_winpack-build-win64-vc14\opencv\modules\imgproc\src\color.cpp, line 11164 简单的一个灰度转换 i
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