terminate called after throwing an instance of 'cv::Exception'

[kailin zhang]

/yolov5-dnn-cpp-python/build$ ./opencv_test_project
Net use yolov5s
terminate called after throwing an instance of 'cv::Exception'
what(): OpenCV(4.5.3-pre) /home/code/opencv/modules/dnn/src/onnx/onnx_importer.cpp:78: error: (-5:Bad argument) Can't read ONNX file: yolov5s.onnx in function 'ONNXImporter'

Aborted (core dumped)