UnsatisfiedLinkError: Could not load library: gstreamer

[chestic3211]

import processing.video.*;

Capture cam;

void setup() { size(640, 480);

String[] cameras = Capture.list();

if (cameras.length == 0) { println("There are no cameras available for capture."); exit(); } else { println("Available cameras:"); for (int i = 0; i < cameras.length; i++) { println(cameras[i]); }

cam = new Capture(this, cameras[0]);
cam.start();     

}
}

void draw() { if (cam.available() == true) { cam.read(); } image(cam, 0, 0); }

Environment Win10 Processing 4.0b2

It keeps saying error and I can't understand why?