sap.ui.define([
   "sap/ui/core/mvc/Controller"
], function (Controller) {
   "use strict";
   return Controller.extend("", {
   });
});

sap.ui.define([
   "sap/ui/core/mvc/Controller"
], function (Controller) {
   "use strict";
   return Controller.extend("de.demo.timepicker.controller.App", {
   });
});

Update App.controller.js