The type of film could be the problem as others have stated but I have used non-Kodak film on more than one occasion without any problems. On the other hand, is the "counter" reading "0" after loading the film...or does it read "E"? If it reads "E" then it will still record events but will not advance the film. This can be simply corrected by attempting to reinstall the film until the teeth on the inside roller grab the film.

Hope this helps.