Error parsing onnx model while trying to use YOLOv5 - c++

Question

I want to use YOLOv5 for object detection Using C++ and OpenCV's DNN. I'm using Windows 10, and VS 2019.
However, the following line of code:
#include <opencv2/opencv.hpp>
int main(int, char **)
{
auto net = cv::dnn::readNet("yolov5s.onnx");
return 0;
}
causes the following error:
OpenCV(4.1.1) C:\opencv-4.1.1\modules\dnn\src\onnx\onnx_importer.cpp:57: error: (-210:Unsupported format or combination of formats) Failed to parse onnx model in function 'cv::dnn::dnn4_v20190621::ONNXImporter::ONNXImporter'
Press any key to continue . . .
This is a link to the original .pt file that I downloaded from the Yolov5 repository, and this is a link to the .onnx file that I converted as per the instructions.
Edit:
Seems there was a problem with the path.
After I wrote the full path to the full .onnx file path, as follows:
#include <opencv2/opencv.hpp>
int main(int, char **)
{
auto net = cv::dnn::readNet("C:/Users/hedey/source/repos/Road_Defects_Detector/yolov5s.onnx");
return 0;
}
Now, I'm getting the following error:
OpenCV(4.1.1) C:\opencv-4.1.1\modules\dnn\src\onnx\onnx_importer.cpp:320: error: (-204:Requested object was not found) Blob not found in const blobs in function 'cv::dnn::dnn4_v20190621::ONNXImporter::getBlob'
Press any key to continue . . .