Help on QuickStart - Please guide

Hi team, I am trying to set up a QuickStart tutorial in my system by referring to this https://github.com/novuhq/react-quickstart Questions/Queries 1. From where I will get values for the below variables REACT_APP_SUB_ID= REACT_APP_APP_ID= above variables are to be created when setting up the Front end 2. Similarly NOVU_API_KEY= The above variable is to be created when setting up the Backend end 3. I do see a page with a text field and a button and I have entered the text and clicked on the send button. I get the below error ERROR The request failed with status code 409 AxiosError: Request failed with status code 409 at settle (http://localhost:3002/static/js/bundle.js:134313:12) at XMLHttpRequest.onloadend (http://localhost:3002/static/js/bundle.js:133004:66)