Powershell: Format-Table : Illegal key count

I'm getting the following error and I don't understand why or what it's asking for.

The object I'm trying to display in a table is:

function newURLObject()
{
#  param ([String]$Value, [Int]$Count = "1", [String]$IP )
   param ([String]$Value, [Int]$Count = "1" )


  $obj = new-object PSObject
  $obj | add-member -type NoteProperty -Name Value -Value $Value.substring(1)
  $obj | add-member -type NoteProperty -Name Count -Value $Count
 # $obj | add-member -type NoteProperty -Name IP -Value $IP

  return $obj
}

The basic flow is the following.

#< Declare Objects>
#< Code to create an array of those objects >

$z = @{Expression={$_.Count};Label="Count";width=5}, @{Expression={$_.Value};Label="URL";count=35} 

$y = $listOfRequestedURLs  | sort count -descending | select -first 30 | ft $z 


Format-Table : Illegal key count
At C:\Temp\parse IIS logs.ps1:231 char:8
+ $y | ft <<<<  $z
    + CategoryInfo          : InvalidArgument: (:) [Format-Table], NotSupportedException
    + FullyQualifiedErrorId : DictionaryKeyIllegal,Microsoft.PowerShell.Commands.FormatTableCommand

I know the values are in the array; but it won't display properly. If I display it without the form开发者_如何学运维at-table the value field just shows up as empty.

You have an illegal format key name, remove it (or rename it to width?):

@{Expression={$_.Value};Label="URL";count=35}