错误如下，是在配置“OPENCV_EXTRA_MODULES_PATH” 这个时候报错的
CMake Error at C:/Users/wyq/Downloads/opencv/sources/cmake/OpenCVUtils.cmake:857 (file):
file MD5 failed to read file
"C:/Users/wyq/Downloads/opencv/opencv_contrib-master/3rdparty/tinydnn/":
Permission denied
Call Stack (most recent call first):
C:/Users/wyq/Downloads/opencv/opencv_contrib-master/modules/dnn_modern/CMakeLists.txt:18 (ocv_download)
Downloading ...
CMake Error at C:/Users/wyq/Downloads/opencv/sources/cmake/OpenCVUtils.cmake:895 (file):
file DOWNLOAD cannot open file for write.
Call Stack (most recent call first):
C:/Users/wyq/Downloads/opencv/opencv_contrib-master/modules/dnn_modern/CMakeLists.txt:18 (ocv_download)
CMake Error at C:/Users/wyq/Downloads/opencv/sources/cmake/OpenCVUtils.cmake:899 (message):
Failed to download . Status=
Call Stack (most recent call first):
C:/Users/wyq/Downloads/opencv/opencv_contrib-master/modules/dnn_modern/CMakeLists.txt:18 (ocv_download)
Configuring incomplete, errors occurred!
See also "C:/Users/wyq/Downloads/opencv/opencv_contrib-master/CMakeFiles/CMakeOutput.log".
See also "C:/Users/wyq/Downloads/opencv/opencv_contrib-master/CMakeFiles/CMakeError.log".
