Home Page Forums MAME MAME Important announcement: SVN server address change

I'm using TortoiseSVN on Windows 7 and when I try to relocate the address from 'svn://messdev.no-ip.org/mess' to 'svn://dspnet.fr/mame/trunk' I get an error message that says:

Subversion reported an error:
'svn://dspnet.fr/mame/trunk' is not the root of the repository

I'm not sure what to do here. Any ideas would be great, thank you.