Using angular-ui-router, How can I use the otherwise method on $stateProvider or how can I use it at all ?
You can also manually inject $state into the otherwise function, which you can then navigate to a non-url state. This has the benefit of the browser not changing the addressbar, which is helpful for handling going back to a previous page.
$urlRouterProvider.otherwise(function ($injector, $location) {
var $state = $injector.get('$state');
$state.go('defaultLayout.error', {
title: "Page not found",
message: 'Could not find a state associated with url "'+$location.$$url+'"'
});
});