$ionicLoading.hide() is not working inside .then

I can't believe that the problem was with the sequence in which parameters were passed for services injection. I had following in the code

.controller('AuthController', ['$auth', '$scope', '$ionicPopup, '$ionicLoading', 
function($auth, $scope, $ionicLoading, $ionicPopup)  {
                
                ..... code .......
 }

The position of $ionicLoading and $ionicPopup was not correct which messed up the things. Correcting the positions solved the problem, but I am still not getting why $ionicLoading.show() was working.

Thanks Class for your help.