EmberError: Nothing handled the action

I have been struggling with making my Ember Application work with Firebase. I went through all the posts here on Stackoverflow about the similar matter but I did not find the answer to my problem. So here it is:

Whenever I try to put data into input fields and submit them with a button i get the console error:

EmberError
code : undefined
description : undefined
fileName : undefined
lineNumber : undefined
message :

"Nothing handled the action 'createBook'. If you did handle the action, this error can be caused by returning true from an action handler in a controller, causing the action to bubble."

My model:

import DS from 'ember-data';

export default DS.Model.extend({
    title: DS.attr('string'),
    author: DS.attr('string'),
    picture: DS.attr('string'),
    buyer: DS.attr('string'),
    bought: DS.attr('boolean', { defaultValue: false }),
    createdAt: DS.attr('date', { defaultValue() { return new Date(); } })
});

And my Controller:

import Ember from 'ember';

export default Ember.Controller.extend({
    actions: {
        createBook: function(){
            var newBook = this.store.createRecord('book', {
                title: this.get('title'),
                author: this.get('author'),
                picture: this.get('picture'),
                buyer: this.get('buyer'),
                bought: this.set(false),
                createdAt: new Date().getTime()
            });
            newBook.save();
            //reset values after create
            this.setProperties({'title' : '',
                                'author' : '',
                                'picture' : '',
                                'buyer' : ''
            });

        }
    }   
});

The template:

<div style ="margin-left:130px;">
    <h1> blabla </h1>
    <br>
    <br>
    <br>
    <br>

</div>

    <button class="btn btn-default" > Create</button>
    
    <ul>
        <li></li>
    </ul>
    

The connection between the Firebase and Ember is set up 100 % properly. For now the rules on firebase have been set to true for both read and write. The only problem is that it does not post the data to Firebase.