# Html5 Uncaught ref error
**URL:** \
**Category:** web dev\
**Created:** [June 18, 2013, 7:11pm UTC](https://forum.kirupa.com/t/html5-uncaught-ref-error/331236 "2013-06-18T19:11:43Z")\
**Posts on this page:** 1\
**Page:** 1
**Author:**  [@na\_il](https://forum.kirupa.com/u/na_il)\
**Post date:** [June 18, 2013, 7:11pm UTC](https://forum.kirupa.com/t/html5-uncaught-ref-error/331236/1 "2013-06-18T19:11:43Z")
I’m trying to learn html5 and js, so I’m following a tutorial and when i try to call the javascript file it obviously isn’t called… why is this? I followed the tutorial exactly but can’t achieve the same results. The html and js file are in the same folder so what gives?
Here is html
```auto
HTML5 Example
```
here is javascript
```auto
(function(window) {
function Person(name, address) {
this.name = name;
this.address = address;
}
Person.prototype.sayHello = function() {
console.log(this.name + " says hello");
};
Person.SPECIES = "human";
}(window));
```