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I have the following simple code to grab the depth data from my Xtion sensor in the main function:

VideoCapture capture( CV_CAP_OPENNI );
while (true) {
    Mat depthMap;
    capture.grab();
    capture.retrieve( depthMap, CV_CAP_OPENNI_DEPTH_MAP );
    //depthMap.convertTo(depthMap,CV_16U);
    cout << "depth: " << depthMap.at<int>(0,0) << endl;
    namedWindow( "Display window", CV_WINDOW_AUTOSIZE );
    imshow( "Display window", depthMap );
    waitKey(30);
}

As far as I've understood, depthMap should be a matrix of type 16UC1, which I have understood should be a single channel integer matrix. Hence the use of the at function. It compiles fine, but on runtime, I get the following error, also when converting to CV_16U:

OpenCV Error: Assertion falied <dims &lt;="2" &amp;&amp;="" data="" &amp;&amp;="" <unsigned="">i0 < <unsigned>size.p[0] && <unsigned><i1*datatype<_tp>::channels> < <unsigned><size.p[1]*channels&lt;&gt;&gt; &amp;&amp;="" &lt;&lt;&lt;<sizeof(size_t=""><<28>|0x8442211> >> <<datatype<_tp>::depth> & <<1 <<3> -1>*4> & 15> == elemSize1<>> in unknown function, file c:\opencv\build\install\include\opencv2\core\mat.hpp, line 537

Does anyone have any idea what this error could mean?