Alliance and Horde on same server

[Tittikaka]

Hey guys! I'm pretty new to Warmane and was wondering if it is possible for me create both an Alliance character and a Horde character on the same server. I was trying to do as such but it was coming up as an error so I'm getting the idea that this may not be possible.

Edit: I forgot to mention that I'm playing on the Deathwing server.

Edit 2: ISSUE SOLVED! I don't know what the issue was really but I am able to create one on each side with no problem now. I'd delete this post but i'm not sure how lol

[Deathmastered]

Playing on Ragnaros, but never had any problems with that.

[Bioness]

You likely downloaded the Warlords of Draenor models and selected a hairstyle that doesn't exist in Wrath of the Lich King. To fix you need change your hair, skin, features, etc until it allows you to make a character.

I really wish they would switch the position of the Warlords model patch with the standard client, it would reduce these kinds of threads, among others, significantly. That or add a large disclaimer before downloading.