Error: Create PartnerApplication "Exchange Online" in DC and On-Premise

Hello,

i get this error when i  Prepare Active Directory for Exchange:

[01/12/2013 10:11:27.0640] [1] [ERROR] The following error was generated when "$error.Clear();
          #
          # O15# 2844081 - Create PartnerApplication "Exchange Online" in DC and On-Premise
          #
          $exch = [Microsoft.Exchange.Data.Directory.SystemConfiguration.WellknownPartnerApplicationIdentifiers]::Exchange;
          $exchApp = Get-PartnerApplication $exch -ErrorAction SilentlyContinue -DomainController $RoleDomainController | Where { $_.UseAuthServer };
          if ($exchApp -eq $null)
          {
              $exchAppName = "Exchange Online";
              $exchApp = New-PartnerApplication -Name $exchAppName -ApplicationIdentifier $exch -Enabled $RoleIsDatacenter -AcceptSecurityIdentifierInformation $false -DomainController $RoleDomainController;
          }

          # Create application account for Exchange
          $appAccountName = $exchApp.Name + "-ApplicationAccount";
          $appAccount = Get-LinkedUser -Identity $appAccountName -ErrorAction SilentlyContinue -DomainController $RoleDomainController;
          if ($appAccount -eq $null)
          {
            $appAccountUpn = $appAccountName.Replace(" ", "_") + "@" + $RoleFullyQualifiedDomainName;
            $appAccount = New-LinkedUser -Name $appAccountName -UserPrincipalName $appAccountUpn -DomainController $RoleDomainController;

            New-ManagementRoleAssignment -Role "UserApplication" -User $appAccount.Identity -DomainController $RoleDomainController;
            New-ManagementRoleAssignment -Role "ArchiveApplication" -User $appAccount.Identity -DomainController $RoleDomainController;
            New-ManagementRoleAssignment -Role "LegalHoldApplication" -User $appAccount.Identity -DomainController $RoleDomainController;
            New-ManagementRoleAssignment -Role "Mailbox Search" -User $appAccount.Identity -DomainController $RoleDomainController;
            New-ManagementRoleAssignment -Role "TeamMailboxLifecycleApplication" -User $appAccount.Identity -DomainController $RoleDomainController;
            New-ManagementRoleAssignment -Role "MailboxSearchApplication" -User $appAccount.Identity -DomainController $RoleDomainController;

            Set-PartnerApplication -Identity $exchApp.Identity -LinkedAccount $appAccount.Identity -DomainController $RoleDomainController;;
          }
        " was run: "Couldn't find object "mydomain.local/Users/Exchange Online-ApplicationAccount". Please make sure that it was spelled correctly or specify a different object.".
[01/12/2013 10:11:27.0640] [1] [ERROR] Couldn't find object "mydomain.local/Users/Exchange Online-ApplicationAccount". Please make sure that it was spelled correctly or specify a different object.
[01/12/2013 10:11:27.0640] [1] [ERROR-REFERENCE] Id=CommonGlobalConfig___907E0EE000AB4117A05F237A81E53AA2 Component=EXCHANGE14:\Current\Release\Shared\Datacenter\Setup
[01/12/2013 10:11:27.0640] [1] Setup is stopping now because of one or more critical errors.
[01/12/2013 10:11:27.0640] [1] Finished executing component tasks.
[01/12/2013 10:11:27.0671] [1] Ending processing Install-ExchangeOrganization
[01/12/2013 10:34:25.0119] [0] The registry key, HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ExchangeServer\V15\Setup, wasn't found.
[01/12/2013 10:34:25.0119] [0] End of Setup