If that's the case, you're missing some details: what sort of flash cart you're using (is it Ok to talk flash carts here?), the version of the Heretic wad you're attempting to use, as well as the version of DSHeretic. I'm not up on all the DS Flash cart info, btw, but it might help someone who is.
Hope I know what I'm talking about here and not barking up the wrong tree? Feel free to call me an idiot.