Error executing script in powershell WSUS GetUpdate() - powershell

Question

I executed a Powershell script, but I got an error
Script
[datetime]$dataIni = "2017/01/01"
[datetime]$dataFim = "2017/01/20"
$serverWsus = "server1"
[void]
$wsus =[Microsoft.UpdateServices.Administration.AdminProxy]::getUpdateServer($serverWsus,$False,8530)
Write-Progress -Activity 'Getting updates...' -PercentComplete 0
$updatesneeded = $wsus.GetUpdate() | ? {($_.CreationDate -gt
[datetime]$dateFirst -and
$_.CreationDate -lt [datetime]$dateLast) -and
($_.Title -notmatch "Itanium" -and
$_.Title -match "Windows Server 2008 x64" -and
$_.UpdateClassificationTitle -eq "Security Updates")}
$i = 0
$total = $updatesneeded.Count
foreach ($update in $updatesneeded)
{
Write-Progress -Activity 'Approving updates...' -Status "%Complete" -
PercentComplete (($i/$total) * 100)
Approve-WsusUpdate -Update $update -Action Install -TargetGroupName 'enviroment'
$i++
}
Write-Host "Updates approved: $total" -ForegroundColor Yellow
Error
Cannot find an overload for "GetUpdate" and the argument count: "0".
At line:11 char:1
+ $updatesneeded = $wsus.GetUpdate() | ? {($_.CreationDate -gt [datetime]$dateFirs ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [], MethodException
+ FullyQualifiedErrorId : MethodCountCouldNotFindBest
Approve-WsusUpdate : Cannot bind parameter 'Update'. Cannot convert the "Microsoft.UpdateServices.Internal.BaseApi.Update" value of type "Microsoft.UpdateServices.Internal.BaseApi.Update"
to type "Microsoft.UpdateServices.Commands.WsusUpdate".
At line:22 char:32
+ Approve-WsusUpdate -Update $update -Action Install -TargetGroupName 'enviroment'
+ ~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [Approve-WsusUpdate], ParameterBindingException
+ FullyQualifiedErrorId : CannotConvertArgumentNoMessage,Microsoft.UpdateServices.Commands.ApproveWsusUpdateCommand