PS1脚本错误

Question

我正在尝试运行在Microsoft网站https://gallery.technet.microsoft.com/scriptcenter/PowerShell-script-to-find-6fc15ecb/view/Discussions#content

上找到的脚本

我不断收到错误：

? : You cannot call a method on a null-valued expression.
At C:\serviceaccounts\report-service-accounts.ps1:57 char:36
+ ... ceList = $data | ? { $_.StartName.toUpper().contains($currentDomain)}
+                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [Where-Object], RuntimeException
    + FullyQualifiedErrorId : InvokeMethodOnNull,Microsoft.PowerShell.Commands.WhereObjectCommand

这是我认为在尝试了几步解决我的问题后，错误在修改后的版本中引用的部分：（很抱歉，第一次在这里发布，并且无法正确地发布整个脚本）

function processCompletedJobs(){

$jobs = Get-Job -State Completed
foreach( $job in $jobs ) {

    $data = Receive-Job $job 
    Remove-Job $job 

    if ( $data.GetType() -eq [Object[]] ){
        $serviceList = $data | ? { $_.StartName.toUpper().contains($currentDomain)}
        foreach( $service in $serviceList ){
            $account = $service.StartName
            $occurance = "`"$($service.Name)`" service on $($service.SystemName)" 
            if ( $script:serviceAccounts.Contains( $account ) ){
                $script:serviceAccounts.Item($account) += $occurance
            }
            else {
                $script:serviceAccounts.Add( $account, @( $occurance ) ) 
            }
        }
    }
    elseif ( $data.GetType() -eq [String] ) {
        $script:warnings += $data
        Write-warning $data
    }
}