Visual Studio throws exception -- simple OpenCV program

As I am completely new to OpenCV, I tried following a tutorial to capture video from a webcam. I used the following code:

#include "opencv2\opencv.hpp"
#include <stdint.h>

using namespace cv;
using namespace std;

int main(int argv, char** argc) {
    Mat frame;
    VideoCapture vid(0);    //0 if we only have one camera
    if (!vid.isOpened()) {  //check camera has been initialized
        cout << "ERROR: Cannot open the camera";
        return -1;
    }

    while (vid.read(frame)) {
        imshow("webcam", frame);
        if (waitKey(30) >= 0) break;
    }
    return 0;
}

When I run the program, a window that shows the video feed opens, but it then almost immediately closes. I get this snippet from the Debug output:

SETUP: Device is setup and ready to capture.

Event: Code: 0x0d Params: 0, 0
Event: Code: 0x0e Params: 0, 0
Exception thrown at 0x000007FEFCBAA06D in test.exe: Microsoft C++ exception: cv::Exception at memory location 0x000000000026EB10.

SETUP: Disconnecting device 0

I don't know what could be wrong with my code or even how to begin debugging this. Any advice? Thank you!