Um... Maybe because you're screwing up the Firelord's textures?
WHY would you rename the blp to replace a particle emitter texture from the Firelord?
Lets look at the page, shall we? It states, as CLEAR AS DAY, that the path is "quilava.blp". Yet you have, for some screwed up reason, decided that rather than use the normal path, you'll overwrite an ingame texture which is used for particle emitters, the Clouds8X8Grey.blp, with this path, and therefore screw up twice as many files!
What part of "Ingame textures are generally not included with the download" didn't you understand? Open that map and check out the normal Firelord, maybe then you'll understand what you did wrong
Oh, and you're making a hero with the Quilava model, not the skin
Yeash, I only had to be told that those things were paths and I figured the rest of this out, what is it with you new people?