Error loading xml file.

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An xml file could not be loaded when running the project on Visual Studio but the .exe of the project runs perfectly.

const char *cascade_name="output.xml";
int lastX = -1;
int lastY = -1;
void detect_and_draw( IplImage* img )
{

    // Create memory for calculations
    static CvMemStorage* storage = 0;
    // Create a new Haar classifier
    static CvHaarClassifierCascade* cascade = 0;
    // Sets the scale with which the rectangle is drawn with
    int scale = 1;
    // Create two points to represent the hand locations
    //CvPoint pt1, pt2;
    // Looping variable
   // int i;
    // Load the HaarClassifierCascade
    cascade = (CvHaarClassifierCascade*)cvLoad(cascade_name,0,0,0);
    // Check whether the cascade has loaded successfully. Else report and error and quit  

    // Allocate the memory storage
    storage = cvCreateMemStorage(0);
    // Create a new named window with title: result
    cvNamedWindow( "result", 1 );
    // Clear the memory storage which was used before
    cvClearMemStorage( storage );
    if(!cascade)
    {
        fprintf( stderr, "ERROR: Could not load classifier cascade\n" );
        return;
    }
    if( cascade )
    {

        // There can be more than one hand in an image. So create a growable sequence of hands.
        // Detect the objects and store them in the sequence
        CvSeq* hands = cvHaarDetectObjects( img, cascade, storage,
                                            1.1, 2, CV_HAAR_DO_CANNY_PRUNING,
                                            cvSize(40, 40) );

        // Loop the number of hands found.
        for( i = 0; i < (hands ? hands->total : 0); i++ )
        {
           // Create a new rectangle for drawing the hand
            CvRect* r = (CvRect*)cvGetSeqElem( hands, i );

            // Find the dimensions of the hand,and scale it if necessary
            pt1.x = r->x*scale;
            pt2.x = (r->x+r->width)*scale;
            pt1.y = r->y*scale;
            pt2.y = (r->y+r->height)*scale;

            // Draw the rectangle in the input image
            cvRectangle( img, pt1, pt2, CV_RGB(230,20,232), 3, 8, 0 );
        }
    }

    // Show the image in the window named "result"
    cvShowImage( "result", img );

}

can somebody tell me what went wrong?