New SharePoint Farm: New-SPConfigurationDatabase: Some or all identity references could not be translated

Hi there,

          I'm installing a new SharePoint farm using AutoSPInstaller, and am getting stuck when it tries to create the Config Database.  

AutoSPInstaller is trying to run this line: New-SPConfigurationDatabase -DatabaseName "configDB" -DatabaseServer SGMELDMZSQL01 -AdministrationContentDatabaseName "AdminContentDB" -Passphrase $passphrase -FarmCredentials $farmCredential

Here's a copy of the error:

- Creating config database "SharePoint_ConfigDB"...
New-SPConfigurationDatabase : Some or all identity references could not be tran
slated.
At C:\SP2010\AutoSPInstaller\AutoSPInstallerFunctions.ps1:806 char
:31+             New-SPConfigurationDatabase <<<<  -DatabaseName "$configDB" -Data
baseServer "$DBServer" -AdministrationContentDatabaseName "$CentralAdminContent
DB" -Passphrase $SecPhrase -FarmCredentials $farmCredential+ CategoryInfo          : InvalidData: (Microsoft.Share...urationDatabase: 
   SPCmdletNewSPConfigurationDatabase) [New-SPConfigurationDatabase], Identit  
  yNotMappedException+ FullyQualifiedErrorId : Microsoft.SharePoint.PowerShell.SPCmdletNewSPCon 
   figurationDatabase

I've searched far and wide, here are some of the things i've tried:  Ensuring all my User accounts are less than 20 chars long, ensuring the SPadmin account and SPfarm account have full access when creating the SQL database, tried running the line of code step by step in Powershell, ensured all my user accounts have the right passwords listed in the AutoSPInstaller config file..  

Any help would be magnificent.  

Thankyou,