Svnadmin dump –deltas

I believe you're encountering a variant of the svndumpfilter: Invalid copy source path problem. This problem occurs when one of the directories/files included by svndumpfilter originally was copied (or, in your case, moved) from a section of the tree that is not being included. The original solution to this was Simon Tatham's svndumpfilter2 but his svn server seems to be down at the moment.

A slightly modified version is available here: http://www.dehora.net/hg/tools/raw-file/tip/svn/svndumpfilter2

Another variant here: http://furius.ca/pubcode/pub/conf/bin/svndumpfilter3.html

And another here: http://www.undersea.com/~nmb/svndumpfilter4

with explanation for svndumpfilter4 here (from archive.org - unfortunately the original is no longer accessible): http://replay.waybackmachine.org/20080827213200/http://www.undersea.com/~nburrell/blog/node/81

The variants are smart enough to use svnlook to retrieve the necessary source material even if it lives outside the included section of the tree.

to be completly safe run as follows:

svnadmin dump /your/repo| svndumpfilter exclude path | svnadmin load /new/repo

take a backup of old repo and when you are sure all is fine just switch it with new one.

more about svndumpfilter here; keywords for google: svn obliterate - maybe some day will be implemented...