Camera Flash with OpenCV3.0.0 Android not working767

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I'm writing a code using OpenCV VIDEO PROCESSING, and i want to open the camera flash when first opening the camera. i have implemented a new class that is extended from JavaCameraView but the app crashes when i run it.

Anyone please can help me to fix the error, or tell me if there another way to make the flash works with VIDEO PROCESSING

the extended class that i use from this sourcelink text as the Following:

public class CameraCustomize extends JavaCameraView  implements Camera.PictureCallback {
private String mPictureFileName;

public CameraCustomize(Context context, AttributeSet attrs) {
    super(context, attrs);
}
public List<String> getEffectList() {
    return mCamera.getParameters().getSupportedFlashModes();
}
public boolean isEffectSupported() {
    return (mCamera.getParameters().getFlashMode() != null);
}
public String getEffect() {
    return mCamera.getParameters().getFlashMode();
}
public void setEffect(String effect) {
    mCamera.getParameters();
    Camera.Parameters params = mCamera.getParameters();
    params.setFlashMode(effect);
    mCamera.setParameters(params);

}
public List<Camera.Size> getResolutionList() {
    return mCamera.getParameters().getSupportedPreviewSizes();
}
public void setResolution(int w, int h) {
    disconnectCamera();
    mMaxHeight = h;
    mMaxWidth = w;
    connectCamera(getWidth(), getHeight());
}

public Camera.Size getResolution() {
    return mCamera.getParameters().getPreviewSize();
}

public void takePicture(final String fileName) {
    this.mPictureFileName = fileName;
    // Postview and jpeg are sent in the same buffers if the queue is not empty when performing a capture.
    // Clear up buffers to avoid mCamera.takePicture to be stuck because of a memory issue
    mCamera.setPreviewCallback(null);

    // PictureCallback is implemented by the current class
    mCamera.takePicture(null, null, this);
}

@Override
public void onPictureTaken(byte[] data, Camera camera) {
    // The camera preview was automatically stopped. Start it again.
    mCamera.startPreview();
    mCamera.setPreviewCallback(this);

    // Write the image in a file (in jpeg format)
    try {
        FileOutputStream fos = new FileOutputStream(mPictureFileName);
        fos.write(data);
        fos.close();
    } catch (java.io.IOException e) {
        Log.e("PictureDemo", "Exception in photoCallback", e);
    }

}

public void cameraRelease() {
    if(mCamera != null){
        mCamera.release();
    }
}

}

and when i call this line i get the error :

private CameraCustomize mOpenCvCameraView;
mOpenCvCameraView.setEffect(Camera.Parameters.FLASH_MODE_ON);

the error is in mCamera.setParameters(params);

Thank you in advanced