12. Add a string Property named movie to the Movie screen
Property must be named movie. Can't be named Fred or Movie or anything else. The python code looks for a Property attached to the Movie screen named movie.
Movie must be in same folder as the blend. If it is in a subfolder include path to subfolder. In other words, if monster.avi is in in subfolder myMovies you would use:
Download: Big Buck Bunny movie trailer
Add Property named material to the Movie screen
Buttons Window menu >> Logic (F4)
Add Property button
Enter movie name