Using Model and storage

I have used the tutorial of 'Building a MusicShop app using Model and Storage'.

1. I created a Model and Storage as below

2. I created a database with the relevant columns

3. I created the page with the list:

4. I create the rest service

5. I created the relevant events

6. I did the relevant mapping in data

Inspite of doing everthing as per the tutorial, when I test my listing shows blank

I have double and triple checked and everything looks fine but there is no listing. Could anyone tell me what am I doing wrong?

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