working on wordpress...

I'm trying to import my OPML file from blogrolling.com into wordpress, but it keeps erroring out (new term, like it?) after two entries. I get this message:

Importing...

XML error: undefined entity at line 13

Inserted ...As if its real

Inserted 25 Hours a Day

Inserted 2 links into category 1. All done! Go manage those links.

Anyone know what I have to do to get my WHOLE blogroll OMPL file into WP? What could be wrong at line 13?

thanks.