How to migrate just part of a repo to another server

I'm trying to move just a few directory trees from a subversion repo to
another server.

On the old server, I run svndump /path/to/old/repo > /tmp/svn-dumpfile
I've copied the svn-dumpfile to the new server.
Now, when I try to run cat svn-dumpfile | svndumpfilter include
/htdocs/CCDB | svnadmin load /path/to/new/repo I get an error from
svndumpfilter:
svndumpfilter: Invalid copy source path '/CCDB'
and I don't see anything in my new repo.
What am I doing wrong?

-- 
Todd D. Taft
UNC Computational Systems Biology
todd_taft_at_unc.edu