Error while installing Mailbox Role - Exchange 2013

Hi Guys,

I am attempting to install Microsoft Exchange Server 2013 on Microsoft Windows Server 2008 R2 with SP1. During the installation it gets to the Mailbox Role Transport Service I get the following error during installation:

Error:
The following error was generated when "$error.Clear(); 
          if ( ($server -eq $null) -and ($RoleIsDatacenter -ne $true) )
          {
            Update-RmsSharedIdentity -ServerName $RoleNetBIOSName
          }
        " was run: "Database is mandatory on UserMailbox. Property Name: Database".

Does anyone have any idea's as to what is causing this issue?

Kind Regards

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TPark IT Technician