ESP32 Web Server Q&A Forum › ESP32 Web Server 0 Vote Up Vote Down Ernest Herrea asked 2 years ago When I click on any of the buttons on created web server I get the following messages: “file:///C:/26/on” file not found. Arduino sketch and index html file seem to be good. 1 Answers 0 Vote Up Vote Down Rui Santos Staff answered 2 years ago Hello Ernest, it looks like you’re using just the HTML formatting open in your web browser. You need to upload the code to your ESP and get the IP address. What’s your ESP IP address? Are you typing the IP server in your web browser? Thanks!