ReferenceError: Angular is not defined

If your module AppName is defined in AngularApp.js, that needs to come before MainCtrl js.

Are your .js files separate angular modules? If so, they should not be listed as modules in your angular.module dependencies.

angular.module('AppName', ['ngRoute']);

Definitely include any of the libs/ files before your own custom code.
So put <script src="libs/angular/angular.js"></script> and <script src="libs/angular-route/angular-route.min.js"></script> before your other javascripts files and you should find the problem fixed.