[eluser]InsiteFX[/eluser]
Well I has a class named Api and it works fine!
Library class by CodeIgniter should have the first character upper case even in the filename!
Naming Conventions
File names must be capitalized. For example: Myclass.php
Class declarations must be capitalized. For example: class Myclass
Class names and file names must match.
Also you cannot have two classes with the same name!