problem in svnadm load : File already exists error

I was trying to syn two repositories in two different places.
I dumped the source a week ago and imported into a local one.
Then I used svnadmin dump -r --incremental to make another dump, and then
try to load into local rep again.
It worked in a couple of times, but in my last try, the dump was huge ( more
than 1G ), and suddenly, I started run into errors like:
File already exists
Directory already exists,

etc.

Well, what is wrong is the directory already exist? Is there anyway to
ignore the errors while doing the loading?

Thanks!

-- 
Li Ma
lima01@gmail.com