Windows Phone in-app products

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C#

Windows

XAML

phone

Good morning

I've started creating a C# Windows Phone (Silverlight) app. I would really like to include in-app products. I've followed the tutorial: Tutorial

I've managed to add all the in-app products to my app. Just to test it, I've added a free in-app product. But when I click the download button in my app, I get an error message. My code is exactly the same as the above tutorial at the moment. I will change the code after fixing this error.

Error message
Service not available
The Store isn't available at the moment.
Please check back in a bit.
Inquiring minds may find this error code helpful: 805a01f4

I've googled the error code. According to the Microsoft website, I have to try again later. I've been trying for 3 days. But I am able to download apps from the store.

What I'm I doing wrong?