I have no subscriptions

Apple apparently thinks you do. Make sure you really don't.

Click on this link to see how to view and mange subscriptions --> If you want to cancel a subscription from Apple - Apple Support

On an iPhone, iPad, or iPod touch

1. Open the Settings app.

2. Tap your name.

3. Tap Subscriptions.

Please include the exact message when you post here.

I still don't know what error message you are seeing so I am going to pass you off onto Apple.

Refer to this page for Apple Support features ➔ Contact - Official Apple Support

If the presented options do not resolve your issue, keep experimenting with any series of selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.

This page has telephone numbers for contacting Apple for support and service ➔ Contact Apple for support and service - Apple Support