TeamCity 6.5 Powershell Runner Issue?

Hi

I am trying to run the following powershell script

Write-Host "build start"

try {

$orphanProcs = Get-Process | where-object {$_.ProcessName.Contains("PostSharp.User")}

    If ($orphanProcs) {
        Write-Host "Killing Orphans"
          $orphanProcs | foreach { Write-Host $_.ProcessName $_.Id }
        $orphanProcs | foreach { Kill $_.Id : Write-Host $? }
    } Else {
        Write-Host "no processes found"
    }
}
catch {
    Write-Host "Problem with running the script"
}
Write-Host "Finished"