Trying to use Gatling recorder and getting Unable to connect to Proxy server

I have followed the instructions as provided on the website. Then I changed the proxy settings on my browser to make it point to port 8000. Now when I go to or any other website on my browser, it says “Unable to connect to the Proxy server”.

The Gatling recorder has been started and it says Running.

Am I missing something here?

Thanks for your help!