CakeEmail - How do i use it?
You need to change your App::uses and separate the two:
App::uses('AppController', 'Controller');App::uses('CakeEmail', 'Network/Email');
App::uses() does only allow two arguments: $className and $location. You passed 4 arguments, that's why CakeEmail is not loaded.
See http://api20.cakephp.org/class/app#method-Appuses and http://book.cakephp.org/2.0/en/core-utility-libraries/app.html#App::uses for more information
the documentation is pretty clear about it:http://book.cakephp.org/2.0/en/core-utility-libraries/email.html?highlight=cakeemail#CakeEmail
"First of all, you should ensure the class is loaded"
on a second look: your app::uses() is wrong. check out the way it is documented.