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CameraCalibration example computes NAN

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I am using OpenCV 3.2.0's example project for achieving CameraCalibration. I have a chessboard checker printed which I use to check for a 4 x 6 pattern of checkers. For the sample image, I use the following: [C:\fakepath\pattern.png](/upfiles/15427084752483776.png) The sample project is provided with the OpenCV Android SDK libraries directly from the OpenCV page: https://opencv.org/releases.html or simply download the version (3.2.0) that I am using: https://sourceforge.net/projects/opencvlibrary/files/opencv-android/3.4.2/opencv-3.4.2-android-sdk.zip/download To locate the sample project, select: opencv-3.2.0-android-sdk.zip > OpenCV-android-sdk > samples > camera-calibration import the project camera-calibration. I have also attached the checkerboard sample images that I used with the project. When I run the project, it computes NAN for (fx and fy) of the CameraMatrix as well as (k1 and k2) of the DistortionCoefficients.

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