Error: You've pointed to Bubble, but we don't have an application associated with this domain yet

If you get this error after buying the domain from google and your live version of bubble is not appearing in www, then you should create an API Key from google cloud platform console.
Go to googe cloud platform console,

Log in

Create a project

Create creditentials

Create API KEY

Copy the API Key and put it in Bubble Main page- settings- domain/email, crete app domain.

Restrict the API key