form_validation class does not load (codeigniter)
All of my code was actually error-less.
However in one of my library classes, i have extended a controller class to load another library which was causing all of my errors.
I have removed it and used $CI =& get_instance(); method for loading other classes and everything works fine now.
You have two Login classes which are being loaded simultaneously. I'll bet money that they are causing a collision. Change the name of the Library class to LoginTools or something like that, and that will help.