I'm a little bit stuck with my excersice. I know there are many questions about this error, but I couldn't find my answer. I hope you can help!

This is my code: 

```
let mijnDivs = document.querySelectorAll('div')
let i = 0;
let woorden = ["kip", "konijn", "paard", "varken", "gerbil", "hamster",
  "rat", "zeeduivel", "narwal", "orka"
];
while (i < mijnDivs.length) {
  i++;
}
setInterval(() => {
  twoSec();
}, 2000);

function randomNumber(min, max) {
  min = Math.ceil(min);
  max = Math.floor(max);
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

function twoSec(woorden) {
  let randomWords = this.classList.add(woorden[randomNumber(0, 9)])
}

```