Android Studio Video Recording

I'm trying to make a camera application using Camera2 API. I have code and when trying to start recording, following error occurs:

java.lang.IllegalStateException at android.media.MediaRecorder.setVideoSource(Native Method) at com.example.mycustomcamera.MainActivity.setUpMediaRecorder(MainActivity.java:203)

private void setUpMediaRecorder() throws IOException {
    mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);
    mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
    mMediaRecorder.setOutputFile(mVideoFileName);
    mMediaRecorder.setVideoEncodingBitRate(1000000);
    mMediaRecorder.setVideoFrameRate(30);
    mMediaRecorder.setVideoSize(mVideoSize.getWidth(), mVideoSize.getHeight());
    mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
    mMediaRecorder.setOrientationHint(mTotalRotation);
    mMediaRecorder.prepare();
}
private void startRecord() {
    try {
        setUpMediaRecorder();
        SurfaceTexture surfaceTexture = mTextureView.getSurfaceTexture();
        surfaceTexture.setDefaultBufferSize(imageSize().getWidth(), imageSize().getHeight());
        Surface previewSurface = new Surface(surfaceTexture);
        Surface recordSurface = mMediaRecorder.getSurface();
        mCaptureRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_RECORD);
        mCaptureRequestBuilder.addTarget(previewSurface);
        mCaptureRequestBuilder.addTarget(recordSurface);
        mCameraDevice.createCaptureSession(Arrays.asList(previewSurface, recordSurface), new CameraCaptureSession.StateCallback() {
            @Override
            public void onConfigured(@NonNull CameraCaptureSession session) {
                try {
                    session.setRepeatingRequest(mCaptureRequestBuilder.build(), null, null);
                } catch (CameraAccessException e) {
                    e.printStackTrace();
                }

            }

            @Override
            public void onConfigureFailed(@NonNull CameraCaptureSession session) {

            }
        }, null);
    } catch (IOException | CameraAccessException e) {
        e.printStackTrace();
    }

}

I have a record button having listener to start recording. When I click the button, the said error occurs.