I want to write a format function to show prices in euros, but it throws an error. What is wrong?

```js
const formatVal = val => new Intl.NumberFormat("de-DE", {
  style: "currency",
  currency: "€"
}).format(val)

formatVal(456)
```

The error that is being thrown:

> 
> Uncaught RangeError: Invalid currency code : â¬
> 
> 
>