Angularjs: Error: [ng:areq] Argument 'HomeController' is not a function, got undefined

Question

This is my demo using angularjs, for creating a service file, and adding service to a controller.

I have two problems with my demo:

• One is when I put <

Answer 1

sampleApp.controller('sampleApp', ['$scope', '$state', function($scope, $state){

Same thing for me, comma ',' before function helped me in fixing the issue -- Error: ng:areq Bad Argument