MS Exchange Setup Error ID no: c1030ad0

During Setup of Microsoft Exchange Server 5.5 on Windows 2000 advanced server, joining an existing Exchange 5.5 site running on a Windows NT 4.0 box
the following error is experienced:
Heading: “Microsoft Exchange Server Setup”
Text: “An error occurred during file replication. Unable to find a file with the correct version number. To view details of the error, see the application event log in the Windows NT Event Viewer on the Microsoft Exchange Server Computer.
Microsoft Exchnage Server Setup
ID no: c1030ad0”
I am unable to fing any reference to this error in Technet or anywhere else. Althought ID no: c1030ad1 is there.
Any help appreciated.