$ injector: modulerr

I get the following error:

angular.js:68 Uncaught Error: [$injector:modulerr] Failed to instantiate module contato due to:  

Error: [$injector:nomod] Module 'contato' is not available! You either misspelled the module name or forgot to load it. If registering a module ensure that you specify the dependencies as the second argument.
http://errors.angularjs.org/1.4.6/$injector/nomod?p0=contato

My page code:

<script>
          checkConnection();
            angular.module("contato", []);
            angular.module("contato").controller("contatoCtrl", function($scope){
                $scope.message="+ cont";


            });

        </script>