Using the Video library on IntelliJ - NoClassDefFoundError

I'm developing a Processing sketch with IntelliJ IDEA. I love this IDE and I really recommend it, but for some reason my sketch works fine in the Processing IDE, but I get a NoClassDefFoundError in IntelliJ when I use the Capture class. Any ideas? 

Here's the code:

2. import processing.core.PApplet;
3. import processing.core.PImage;
4. import processing.video.Capture;
5. 
   
6. public class coketruck extends PApplet{
7.     Capture cam;
8.     PImage cocacola;
9.     boolean activate = false;
10.     public void setup(){
11.         size(900,600);
12.         cocacola = loadImage("cokelogo.JPG");
13.         String[] cameras = Capture.list();
14.         cam= new Capture(this, cameras[0]);
15.     }
16.     public void draw(){
17.         if(activate == false){
18.             image(cocacola,0,0,width,height);
19.             println("woah");
20.         }
21.         else{
22.             if (cam.available() == true) {
23.                 cam.read();
24.             }
25.             image(cam, 0,0,width,height);
26.         }
27.     }
28.     public void mouseClicked(){
29.         println("hello");
30.         activate = true;
31.         cam.start();
32.     }
33. 
    
34. }

And the error message is the following: