findChessboardCorners returing false boolean value?

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I am using findChessboardCorners function to find the corners in a chessboard image.

When I am executing the function on this image, I am getting an array of detected corners but the bool value returned by the function is zero. Shouldn't it be one since I'm getting an array of detected corners?

Code-

Mat inImage;
inImage = imread("left01.jpg");
//-> Output
vector<Point2f> corners; // This will be filled by the detected corners

bool found = findChessboardCorners( inImage, Size(8,6), corners, CV_CALIB_CB_ADAPTIVE_THRESH );

cout<<"found::"<<found<<endl;
cout<<"number of corners detected:"<<corners.size()<<endl;