PowerShell HTML method getElementsByClassName returns null - html

Question

I'm trying to write a PowerShell script which fetches an HTML page from a website and extracts some information from it.
My code looks like this:
$html = (invoke-webrequest -uri $address).parsedHTML;
$bodyHTML = $html.body.getElementsByClassName("news-item")[0].innerText;
The script fetches the website fine. The important part of the website looks like this:
...
<DIV class=news-item>
Important Information
...
The Problem:
I always get an error message: "cannot index into a null array".
The getElementsByClassName()-Function does not return anything.
If I list all div's and show the class names:
$html.body.getElementsByTagName("div") | select className
it lists all the class names including "news-item", which I am looking for.
Does anybody have an idea what the problem might be?

Answer 1

The problem seems to be the PowerShell version used. The PowerShell version running on the machine was 4.11.
With PowerShell 5.1 on a different machine the code worked fine.
As a workaround, because PowerShell coult not be updated and I was only looking for div-elements, I used the following code:
$bodyHTML = ($html.body.getElementsByTagName("div") | where { $_.className -eq "news-item" })[0].innerText;