Incorrect method when trying to deploy a SSRS report using powershell

My script below yields this error "Method invocation failed because [SSRS.ReportService2010.ReportingService2010] doesn't contain a method named 'CreateReport'.
At C:\Users\mike.davis\Desktop\BI\REPORTS\TPFReport\TPFReport\bin\Debug\Bulk SSRS Report Deployment with PowerShell.ps1:28 char:40
+     $Warnings = $SSRSProxy.CreateReport <<<< ($_.ReportName, $_.TargetReportFolder, $True, $Bytes, $Null)
    + CategoryInfo          : InvalidOperation: (CreateReport:String) [], RuntimeException
    + FullyQualifiedErrorId : MethodNotFound"

$SourceDirectory = "C:\Users\mike.davis\Desktop\BI\REPORTS\TPFReport\TPFReport\bin\Debug"
$DeploymentFileName = "AutoDeploymentDEV.csv"

$DeploymentFileName = $SourceDirectory + "\" + $DeploymentFileName

Import-Csv $DeploymentFileName | foreach {

   
    $ReportServiceURI = "http://" + $_.ReportServerName + "/_vti_bin/ReportServer/ReportService2010.asmx"
    $RDLFileName = $SourceDirectory + "\" + $_.RDLFileName
    write-host "----------------------------------------------------------------------------------------------------------------------------------------"
    write-host "Deploying" $RDLFileName
    write-host " to" $_.TargetReportFolder "as" $_.ReportName
    $SSRSProxy = new-webserviceproxy -Uri $ReportServiceURI -Namespace SSRS.ReportService2010 -UseDefaultCredential
    $Bytes = [System.IO.File]::ReadAllBytes($RDLFileName)
    $Warnings = $SSRSProxy.CreateReport($_.ReportName, $_.TargetReportFolder, $True, $Bytes, $Null) 

    if ($Warnings) {
        foreach ($Warning in $Warnings) {
            write-warning $Warning.Message
        }
    }
}

What Method should I use or what am I doing wrong? Reportservices2005 has a CreateReport Method. What happened to that in ReportService2010?