How to connect shopify store to the application?

I follow this link # 3 to Embed the application with store
But there’s output like this

Without seeing your code, it is difficult to know what the exact issue is. Can you post a link to your project code (i.e. or GitHub)? Here is the link .

The link you provided is invalid.

Yeah .sorry because it’s a private repo . can you please guide me about how do i connect my application to the store as i follow this link but it does not work .