获取Stop-NlbClusterNode：找不到与参数名称“Credential”匹配的参数。停止节点时出错

Question

我使用以下脚本来停止计算机上的节点。但是获取Get Stop-NlbClusterNode：找不到与参数名称'Credential'匹配的参数。使用power-shell脚本和Windows 2012停止节点时出错。另外如何在此脚本中传递密码。请指导。

#This script monitors stopped application pools along with websites on the current host
$RemoteHostName = "testserver"
    #set hostname
    #import NLB module.  In PS v3 these lines should be redundant and can be removed.
    import-module NetworkLoadBalancingClusters
    "Networking Load Balancing Clusters Module imported"
    # requests the user's credentials and assigns the credentials to an object
    $Credential = Get-Credential "domain\testuser"
    "Get credentials for test user done"
    #uses the nlb cmdlets to check the state of the current cluster
    $clusterstatus = get-nlbclusternode -nodename $RemoteHostName
    [string]$status = $clusterstatus | select -expand state
    "Got the status of cluster $clusterstatus"
        #if the node has already been stopped dont do anything
    if ($status -eq "Stopped")
        {
            #donothing 
            "Node alrerady stopped"
        }

        #if the node hasnt been stopped, stop the node and then send an email out
    else
        {
        "Starting to drain stop the node"
            stop-NlbClusterNode -HostName $RemoteHostName -Credential $Credential -Drain
        }

start-sleep -s 30