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answer (-215:Assertion failed) img.type() == CV_8UC1

related (-215:Assertion failed) img.type() == CV_8UC1 in func

related open cverror: (-215:Assertion failed) src.type() == CV_8UC1 in function 'cv::adaptiveThreshold'

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Expected Ptr<cv::UMat> for argument 'img'

OpenCV(4.5.5) D:\a\opencv-python\opencv-python\opencv\modules\objdetect\src\cascadedetect.cpp:1689: error: (-215:Assertion failed) !empty() in function 'cv::CascadeClassifier::detectMultiScale'

error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'

error: (-215:assertion failed) !empty() in function 'cv::cascadeclassifier::detectmultiscale'

error: (-215:Assertion failed) !empty() in function 'cv::CascadeClassifier::detectMultiScale'

cv2.error: OpenCV(4.5.5) /io/opencv/modules/imgproc/src/thresh.cpp:1555: error: (-2:Unspecified error) in function 'double cv::threshold(cv::InputArray, cv::OutputArray, double, double, int)' > THRESH_OTSU mode: > 'src_type == CV_8UC1 || src_type == C

OpenCV(4.5.4-dev) D:\a\opencv-python\opencv-python\opencv\modules\imgproc\src\resize.cpp:4051: error: (-215:Assertion failed) !ssize.empty() in function 'cv::resize'

cv2.error: OpenCV(4.8.1) /Users/xperience/GHA-OpenCV-Python/_work/opencv-python/opencv-python/opencv/modules/imgproc/src/color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor

error: OpenCV(4.8.0) /io/opencv/modules/imgproc/src/color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor' site:stackoverflow.com

cv2.error: OpenCV(4.3.0) /io/opencv/modules/imgproc/src/drawing.cpp:2374: error: (-215:Assertion failed) p.checkVector(2, CV_32S) >= 0 in function 'fillPoly'

cv2.error: OpenCV(4.5.3) C:\Users\runneradmin\AppData\Local\Temp\pip-req-build-q3d_8t8e\opencv\modules\imgproc\src\color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'

opencv(4.4.0) c:\users\appveyor\appdata\local\temp\1\pip-req-build-71670poj\opencv\modules\imgproc\src\color.cpp:182: error: (-215:assertion failed) !_src.empty() in function 'cv::cvtcolor'

cv2.error: OpenCV(4.5.2) .error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor' in command line

OpenCV(3.4.11) Error: Assertion failed (_img.rows * _img.cols == vecSize) in CvCascadeImageReader::PosReader::get

OpenCV(3.4.11) Error: Assertion failed (_img.rows * _img.cols == vecSize) in CvCascadeImageReader::PosReader::get

OpenCV(3.4.11) Error: Assertion failed (_img.rows * _img.cols == vecSize) in CvCascadeImageReader::PosReader::get

error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'cv::imshow'

error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'cv::imshow'

opencv(4.4.0) c:\users\appveyor\appdata\local\temp\1\pip-req-build-71670poj\opencv\modules\imgproc\src\color.cpp:182: error: (-215:assertion failed) !_src.empty() in function