svn error 1 : Svn too old. Using mozilla-build

I did everything i needed to start developing and helping with bugs in SB.

But i got this error in mozilla-build. The svn is a very old client, error 1, or something like that, to work with the songbird folder.

What does it mean?. I installed subversion 1.4.+ for Windows and i had Tortoise , not the last, but nearly the last version.

I don ́t know anything else about SVN, and i installed everything i needed: Vs2005, using start-msvc8.bat, everything ok, and everything from svn downloaded and up to date.

Thanks