ScriptAgent und ein Fehler :-(

<?xml version="1.0" encoding="utf-8" ?>  
<Configuration version="1.0">  
 <Feature Name="MailboxProvisioning" Cmdlets="enable-mailbox">  
  <ApiCall Name="OnComplete">  
	if ($succeeded) 
	{
	do {
         start-sleep 20
         $mbxExists = Get-MailBoxPermission -Identity $USER -User "NT AUTHORITY\SELF" -ErrorAction SilentlyContinue | FW IsValid  
		} while (!$mbxExists)
		
			$USER = $provisioningHandler.UserSpecifiedParameters["Name"]  
			$OU = (Get-User -Identity $USER).OrganizationalUnit
			$ATT = (Get-mailbox -Identity $USER).customattribute1
	
		if (
			($OU -eq "it-contact.local/Frankfurt (FFM)/IT-Contact/Users") -and ($ATT -eq "extern")  
        	)	{
					Enable-Mailbox -Identity $USER -Archive -ArchivDatabase ArchivMDB
					Set-CASMailbox -Identity $USER -PopEnabled $false -ImapEnabled $false
					Set-Mailbox -Identity $USER _
					-SingleItemRecoveryEnabled $true _
					-UseDatabaseQuotaDefaults $false _
					-IssueWarningQuota 450MB _
					-ProhibitSendQuota 500MB _
					-ProhibitSendReceiveQuota 550MB _
					-ArchiveQuota 1GB _
					-ArchiveWarningQuota 800MB _
					-RetainDeletedItemsFor "30.00:00:00" _  
					-AddressBookPolicy "IT-Contact extern GmbH"  
				}
		
		elseif (
				($OU -eq "it-contact.local/Frankfurt (FFM)/IT-Contact/Users") -and ($ATT -ne "extern")  
				)	{
					Enable-Mailbox -Identity $USER -Archive -ArchivDatabase ArchivMDB
					Set-CASMailbox -Identity $USER -PopEnabled $false -ImapEnabled $false
					Set-Mailbox -Identity $USER _
					-SingleItemRecoveryEnabled $true _
					-UseDatabaseQuotaDefaults $false _
					-IssueWarningQuota 900MB _
					-ProhibitSendQuota 1GB _
					-ProhibitSendReceiveQuota 1,1GB _
					-ArchiveQuota 2GB _
					-ArchiveWarningQuota 1,8GB _
					-RetainDeletedItemsFor "30.00:00:00" _  
					-AddressBookPolicy "IT-Contact GmbH"  
					}		

		elseif (
				($OU -eq "it-contact.local/Frankfurt (FFM)/MOC Testumgebung/Users") -and ($ATT -eq "extern")  
				)	{
					Set-CASMailbox -Identity $USER -PopEnabled $false -ImapEnabled $false
					Set-Mailbox -Identity $USER _
					-SingleItemRecoveryEnabled $true _
					-UseDatabaseQuotaDefaults $false _
					-IssueWarningQuota 180MB _
					-ProhibitSendQuota 200MB _
					-ProhibitSendReceiveQuota 220MB _
					-RetainDeletedItemsFor "30.00:00:00" _  
					-AddressBookPolicy "MOC Testumgebung extern"  
					}	

		elseif (
				($OU -eq "it-contact.local/Frankfurt (FFM)/MOC Testumgebung/Users") -and ($ATT -ne "extern")  
				)	{
					Set-CASMailbox -Identity $USER -PopEnabled $false -ImapEnabled $false
					Set-Mailbox -Identity $USER _
					-SingleItemRecoveryEnabled $true _
					-UseDatabaseQuotaDefaults $false _
					-IssueWarningQuota 180MB _
					-ProhibitSendQuota 200MB _
					-ProhibitSendReceiveQuota 220MB _
					-RetainDeletedItemsFor "30.00:00:00" _  
					-AddressBookPolicy "MOC Test intern"  
					}	
	}
   </ApiCall>
  </Feature>
</Configuration>

Summary: 1 item(s). 1 succeeded, 0 failed.
Elapsed time: 00:00:06


XXXXXX XXXXXX
Completed

Warning:
The cmdlet extension agent with the index 5 has thrown an exception in OnComplete(). The exception is: Microsoft.Exchange.Provisioning.ProvisioningException: ScriptingAgent: Exception thrown while invoking scriptlet for OnComplete API: Missing expression after unary operator '-'.. ---> System.Management.Automation.ParseException: Missing expression after unary operator '-'.  
   at System.Management.Automation.Runspaces.AsyncResult.EndInvoke()
   at System.Management.Automation.PowerShell.EndInvoke(IAsyncResult asyncResult)
   at Microsoft.Exchange.Configuration.MonadDataProvider.MonadPipelineProxy.ClosePipeline(MonadAsyncResult asyncResult)
   --- End of inner exception stack trace ---
   at Microsoft.Exchange.ProvisioningAgent.ScriptingAgentHandler.OnComplete(Boolean succeeded, Exception e)
   at Microsoft.Exchange.Provisioning.ProvisioningLayer.OnComplete(Task task, Boolean succeeded, Exception exception)

Exchange Management Shell command completed:
Enable-Mailbox -Identity 'it-contact.local/Frankfurt (FFM)/IT-Contact/Users/XXXXX XXXXX' -Alias 'XXXXX'  

Elapsed Time: 00:00:06