This project was done for a primer2 and not for the open4, then you need to do some changes:
* Configuration: make a new project -> select primer -> choose your primer and save the application.
* From Ride7, remove "Application.c".
* Add in your new application: "maze.c" and "maze_112_128.h" from the maze project you already downloaded.
* Add "maze.c" to your new application: right click on the application name -> Add -> item
* Add code on "maze.c":
add this code