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JavaScript JavaScript and the DOM (Retiring) Getting a Handle on the DOM Select All Elements of a Particular Type

error 404

When i try and follow along with these lessons i keep getting error: Failed to load resource: the server responded with a status of 404 (Not Found) even if i leave app.js blank

here is my index.html i feel like the problem has to be here somewhere because i get an error without even touching app.js

<!DOCTYPE html> <html> <head> <title>JavaScript and the DOM</title> <link rel="stylesheet" href="css/style.css"> </head> <body> <h1 id="myHeading">JavaScript and the DOM</h1> <p>Making a web page interactive</p> <p>Things that are purple:</p> <ul> <li>grapes</li> <li>amethyst</li> <li>lavender</li> <li>plums</li> </ul> <script src="app.js"></script> </body> </html>

i for the life of me cant figure out where i am going wrong. thank you in advance!

Please forgive the format for my HTML. i copy and pasted with correct whitespace - im not sure why it condensed :/