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addEventListener on getElementsByClassName

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Last Modified: 2015-04-27
Don't know why this doesn't work?

window.onload  = function (){
    var inner = document.getElementsByClassName('inner');
    inner[0].addEventListener("scroll", runthis);
}

Receive an error on console:

Cannot read property 'addEventListener' of undefined

The class exists and there's only one of them. So I'm only targeting the first and only element.
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