Here is the wiki entry for the "bad_httpd_conf" error. http://wiki.dreamhost.com/Bad_httpd_conf
If this is really a redirect using dreamhost's redirection via the panel you should open a support ticket, also via the panel, to get it fixed. A faster method however might be to delete your redirection via the panel, wait an hour to make sure there is time for than change to be pushed from the panel to the server (that's normally only takes 10-15 minutes, but give it plenty of time), THEN go back and re-add your re-direction via the panel.
Users here might be able to give you better answers if you give us both domain names. Most of us answering in this forum are customers just like you with no ability to look anything up on your account, but if you give us both domain names and we can watch what happens, sometime we can spot the problem better.