Copy failure after renaming server

We are in the process of moving one of our repositories to a different
server. To start with, the sysadmin made an alias for our new server so
I am in the process of changing externals and such to use the new server
alias. After doing that and commiting the externals, I checked out a
fresh copy of the project and attempted a build. The last part of the
build creates a tag by copying from the WC to the tags directory. This
part of the build is failing so I ran the commands manually. Here is
the output:

NOTE: This is on a Windows server. Dartmouth was the old server,
ProdSvr is the new server.

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H:\products\DVRPro\build>svn cp .
svn://prodsvr/products/repositories/products/D
VRPro/tags/1.1.124.0_full_dev -m "Tagging 1.1.124.0_full_dev"
svn: Commit failed (details follow):
svn: Source url
'svn://prodsvr/products/repositories/Products/DVRPro/trunk' is from
different repository
H:\products\DVRPro\build>findstr /i /s "dartmouth" *
H:\products\DVRPro\build>svn info
Path: .
URL: svn://prodsvr/products/repositories/Products/DVRPro/trunk
Repository UUID: 1b9b7112-9503-f94e-817d-e156724c8b55
Revision: 2203
Node Kind: directory
Schedule: normal
Last Changed Author: wta
Last Changed Rev: 2203
Last Changed Date: 2006-04-19 16:54:08 -0400 (Wed, 19 Apr 2006)
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Any ideas why the copy is failing?  
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