URGENT! False entry to domain mapping plugin!

Hi,

I was working on domain mapping tool on a multisite install and I misspelled the domain name to be mapped. Now the site getting directed to a wrong address. (darkwod.net instead of darkwood.net), the site is down and I can get rid of this only by deleting the plugin by filezilla. I tried to download the plugin again, but whenever I activate it the site again goes down being directed to the wrong address. How can I get rid of this. This is really urgent.

Thanks