Opencv Java MatOfFloat4 object cannot be created via constructor

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I've a class which has the following variable:

private MatOfFloat4 horizonLine = new MatOfFloat4();

which I later on pass into a function as follows:

Imgproc.fitLine(tmpPoints, horizonLine, Imgproc.CV_DIST_L1, 0, 0.01, 0.01);

However, I get an error saying that:

Exception in thread "main" java.lang.UnsatisfiedLinkError: org.opencv.core.Mat.n_Mat()J
    at org.opencv.core.Mat.n_Mat(Native Method)
    at org.opencv.core.Mat.<init>(Mat.java:24)
    at org.opencv.core.MatOfFloat4.<init>(MatOfFloat4.java:12)
    at obstacleDetector.HorizonDetector.<init>(HorizonDetector.java:327)
    at obstacleDetector.HorizonDetector.getInstance(HorizonDetector.java:59)
    at obstacleDetector.Detector.<clinit>(Detector.java:28)

which directs me to the initialization of the variable. Why can't OpenCV intialize this variable? What is wrong?

P.S: If it matters, the class which I place this variable, is a Singleton class:

public static HorizonDetector getInstance() {
        if (_instance == null) {
            _instance = new HorizonDetector();
        } else {
            System.out.println("Same instance of the Horizon Detector-Singleton class already exists.");
        }
        return _instance;
    }

Any thoughts?