Language Pack Um8 auf Exchange 2016 lässte ich nicht entfernen

[PS] C:\Windows\system32>Setup.exe /RemoveUmLanguagePack:de-DE

Microsoft Exchange Server 2016 Cumulative Update 8 Unattended Setup

UM Language Pack for de-DE

Performing Microsoft Exchange Server Prerequisite Check


Configuring Microsoft Exchange Server

    UM language pack for (de-DE)                                                                      FAILED

The following error was generated when "$error.Clear();  
 uninstall-MsiPackage -ProductCode $RoleProductCode -LogFile
$RoleLogFilePath -PropertyValues ("ESE=1");  

 $lochost=hostname;
 $exchsrv=Get-ExchangeServer -Identity $lochost
-DomainController $RoleDomainController;
 if (-not $exchsrv.IsMailboxServer)
 {
 uninstall-MsiPackage -ProductCode
$RoleTeleProductCode -LogFile $RoleLogFilePath;
 }

 if ( $RoleTransProductCode -ne [system.guid]::empty )
 {

uninstall-MsiPackage -ProductCode $RoleTransProductCode -LogFile $RoleLogFilePath;
 }

 uninstall-MsiPackage
-ProductCode $RoleTtsProductCode -LogFile $RoleLogFilePath;
 " was run: "System.ArgumentNullException: The product code  
or package path must be provided.
Parameter name: ProductInfo
 at
Microsoft.Exchange.Configuration.Tasks.Task.ThrowTerminatingError(Exception exception, ErrorCategory category, Object
target)
 at Microsoft.Exchange.Management.Deployment.UninstallMsi.InternalValidate()
 at
Microsoft.Exchange.Configuration.Tasks.Task.<ProcessRecord>b__91_1()
 at
Microsoft.Exchange.Configuration.Tasks.Task.InvokeRetryableFunc(String funcName, Action func, Boolean
terminatePipelineIfFailed)".  


The Exchange Server setup operation didn't complete. More details can be found in ExchangeSetup.log located in the  
<SystemDrive>:\ExchangeSetupLogs folder.

# Default remove steps for umlanguagepack.
# Programmatically generated on 14.06.2018 13:17:26.

#
# Variable Declarations
#
$RoleDomainController = 'dcserver01.test.local'  
$RoleInstallationMode = 'Uninstall'  
$RoleInvocationID = '20180614-13172605462101107158'  
$RoleIsDatacenter = $False
$RoleIsDatacenterDedicated = $False
$RoleIsPartnerHosted = $False
$RoleLanguage = 'de-DE'  
$RoleLogFilePath = 'C:\ExchangeSetupLogs\remove-UMLanguagePack.de-DE.msilog'  
$RoleProductCode = '8ef42e64-6de1-47e6-a07f-0e77b83f98a6'  
$RoleProductPlatform = 'amd64'  
$RolePropertyValues = 'ESE=1'  
$RoleShouldRestartUMService = $True
$RoleTeleProductCode = '955f43d9-38c4-4c22-bee3-1a6c63f968fa'  
$RoleTransProductCode = '00000000-0000-0000-0000-000000000000'  
$RoleTtsProductCode = '00000000-0000-0000-0000-000000000000'  

#
# Component tasks
#

# Tasks for 'Unified Messaging Finalization' component  
# [ID = UnifiedMessagingFinalization___8a6b98ad68be497a9b3ea4c351b52ae6, Wt = 1, isFatal = True] "Stopping the Microsoft Exchange Unified Messaging service."  
14.06.2018 13:17:26:stop-SetupService -ServiceName MSExchangeUM

# Tasks for 'UM Language Pack Configuration' component  
# [ID = UmLanguagePackComponent___98c7f337c1334ef59c2ac59e52813c16, Wt = 1, isFatal = True] "Configuring the server."  
14.06.2018 13:17:26:
          uninstall-MsiPackage -ProductCode $RoleProductCode -LogFile $RoleLogFilePath -PropertyValues ("ESE=1");  

          $lochost=hostname;
          $exchsrv=Get-ExchangeServer -Identity $lochost -DomainController $RoleDomainController;
          if (-not $exchsrv.IsMailboxServer)
          {
            uninstall-MsiPackage -ProductCode $RoleTeleProductCode -LogFile $RoleLogFilePath;
          }

          if ( $RoleTransProductCode -ne [system.guid]::empty )
          {
            uninstall-MsiPackage -ProductCode $RoleTransProductCode -LogFile $RoleLogFilePath;
          }

          uninstall-MsiPackage -ProductCode $RoleTtsProductCode -LogFile $RoleLogFilePath;