sapui5, MessageToast.show is not a function, although sap/m/MessageToast has already been imported - sapui5

Question

I would like to display a messager in sapui5 Application, when onSave is printed or at the init function ist started. but i have always a error in the console and the messageToast do not work.
Errormessage in console:
Uncaught (in promise) TypeError: MessageToast.show is not a function
this is my controller.js:
sap.ui.define(['sap/ui/core/mvc/Controller',
'timeTrackertimeTracker/controller/BaseController',
'sap/ui/model/json/JSONModel',
"sap/m/MessageToast",
"sap/ui/model/odata/ODataModel",
"sap/ui/core/routing/History"
],
function(Controller, BaseController, MessageToast, JSONModel, ODataModel, History) {
"use strict";
//Global variables
//var _oController, oModel, oView;
var Calendarcontroller = BaseController.extend("timeTrackertimeTracker.controller.Calendarform", {
/* =========================================================== */
/* lifecycle methods */
/* =========================================================== */
onInit: function() {
//Store controller reference to global variable
this.getRouter().getRoute("Calendarform").attachPatternMatched(this._onRouteMatched, this);
MessageToast.show("init");
},
/* =========================================================== */
/* event handlers */
/* =========================================================== */
_onRouteMatched: function() {
// register for metadata loaded events
var oModel = this.getModel("appointments");
oModel.metadataLoaded().then(this._onMetadataLoaded.bind(this));
},
_onMetadataLoaded: function () {
// create default properties
var oProperties = {
Id: "Id" + parseInt(Math.random() * 1000000000)
/* duration: "",
resttime: "",
title: "",
starttime: "",
endtime: "",
Description: ""*/
};
// create new entry in the model
this._oContext = this.getModel("appointments").createEntry("/appointments", {
properties: oProperties
,
success: this._onCreateSuccess.bind(this)
});
// bind the view to the new entry
this.getView().setBindingContext(this._oContext, "appointments");
},
onSave: function(oEvent) {
// bind the view to the new entry
//this.getView().setBindingContext(this._oContext);
this.getModel("appointments").submitChanges();
},
_onCreateSuccess: function (oEvent) {
// navigate to the new product's object view
this.getRouter().navTo("AppointmentsList", true);
// unbind the view to not show this object again
this.getView().unbindObject();
// show success messge
/* var sMessage = this.getResourceBundle().getText("newObjectCreated", [ oEvent.Id ]);
MessageToast.show(sMessage, {
closeOnBrowserNavigation : false
});*/
},
/* _onCreateSuccess: function (oAppointment) {
// show success messge
var sMessage = this.getResourceBundle().getText("newObjectCreated", [ oAppointment.Title ]);
MessageToast.show(sMessage, {
closeOnBrowserNavigation : false
});
},
*/
onCancel: function() {
this.onNavBack();
//this.getView().getModel("appointments").deleteCreatedEntry(this._oContext);
},
/**
* Event handler for navigating back.
* It checks if there is a history entry. If yes, history.go(-1) will happen.
* If not, it will replace the current entry of the browser history with the worklist route.
* #public
*/
onNavBack : function() {
/* var oRouter = sap.ui.core.UIComponent.getRouterFor(this);
oRouter.navTo("AppointmentsList");*/
var oHistory = History.getInstance(),
sPreviousHash = oHistory.getPreviousHash();
// discard new product from model.
this.getModel("appointments").deleteCreatedEntry(this._oContext);
if (sPreviousHash !== undefined) {
// The history contains a previous entry
history.go(-1);
} else {
// Otherwise we go backwards with a forward history
var bReplace = true;
this.getRouter().navTo("AppointmentsList", {}, bReplace);
}
}
});
return Calendarcontroller;
});

Answer 1

Exchange places of parameters MessageToast and JSONModel in function (line 9): in the dependency list sap/ui/model/json/JSONModel mentioned before sap/m/MessageToast