Exchange 2010 installation issues

I am having some issues installation Exchange 2010 on a Windows 2008 R2 domain server. I have an Exchange 2003 and a windows domain server 2003 currently running an am migrating over to the new server.
The error is;
~~~~~~~~~~~~~~~~
Client Access Role
Failed

Error:
The following error was generated when "$error.Clear(); $thisServer = Get-ExchangeServer $RoleFqdnOrName; $adSiteId = $thisServer.Site; $pureMailboxServersFqdns = Get-ExchangeServer | Where {$adSiteId -eq $_.Site -and $_.IsMailboxServer -and -not $_.IsClientAccessServer} | ForEach {$_.Fqdn}; Get-MailboxDatabase | Where { ($pureMailboxServersFqdns -contains $_.RpcClientAccessServer) -and ($adSiteId -eq (Get-ExchangeServer $_.Server).Site)} | Set-MailboxDatabase -RpcClientAccessServer $thisServer" was run: "Value cannot be null.
Parameter name: key".

Value cannot be null.
Parameter name: key
~~~~~~~~~~~~~~~~~~~
johnbowdenAsked:
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Satya PathakLead Technical ConsultantCommented:
For this issue i would suggest you to use ADSIEdit to remove the mailbox databases in the Exchange Administrative Group.  Once we did this, then the install went fine and has completed successfully all the way through.
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johnbowdenAuthor Commented:
can you tell me which part that I need to remove? I don't want to create problems with what is running on the 2003 server
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