Cannot resolve symbol 'Builder'

[dbc2201]

FaceDetector faceDetector = new
                        FaceDetector.Builder(getApplicationContext()).setTrackingEnabled(false)
                        .build();    // Cannot resolve symbol 'Builder'
                if(!faceDetector.isOperational()){    //  Cannot resolve method 'isOperational()'
                    new AlertDialog.Builder(v.getContext()).setMessage("Could not set up the face detector!").show();
                    return;
                }

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I tried to build the sample face detection app from the codelab provided here but the code seems to be broken