javascript - How do I fix this AngularJS error: Can't find variable: $interval -

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modulet1.controller('sessionclock', function ($scope) {     $interval(wtf, 5000); });

from error console: 

error: can't find variable: $interval

i using angularjs 1.3.14. setting $scope variables in controller , data-binding them in html works fine, until add $interval or $timeout line controller , error. what's going on?

modulet1.controller('sessionclock', [ '$scope','$interval', function ($scope,$interval) {     $interval(wtf, 5000); }]);

this should solve problem. make sure have same order in injector , function().


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