Calling library method inside model error (with solution)

Whats the reason why you are loading the second library into the first one? Wouldn't it be better to:

PHP Code:

class Mysecondlibrary extends Mylibrary 


That way, you can call methods in Mylibrary through $this->mysecondlibrary->

Thanks for your contribution, in this case I am using mylibrary only to load all libraries, methods, helpers into the memory but mylibrary has no methods or variables that I can use from mysecondlibrary.