Powershell Scanner in Scan Profile

Hello!

I have a question regarding the usage of Powershell in scan profiles. I've been trying to add a script that checks the free space available for only the C: drive, but I can't seem to get it working. The problem is that once I enter into a dynamic collection and go to set said scanner as a filter, the column selection reads NULL.

Here is the script,

$disk = Get-WmiObject Win32_LogicalDisk -Filter "DeviceID='C:'"
[PSCustomObject]@{
    DiskLetter   = $disk.DeviceID
    FreePercent  = [math]::Round(($disk.freespace / 1GB) / ($disk.Size / 1GB) * 100)
    FreeSpace    = [math]::Round($disk.FreeSpace / 1GB)
    DiskSize     = [math]::Round($disk.size / 1GB)
}

And here is the error that I receive:

Thanks!

Evan