I have a node repl (Source code: https://repl.it/@Lumpy_Wiggles/Me-Trying-Node, website URL: https://Me-Trying-Node--lumpy-wiggles.repl.co) and I get this:

Error: ENOENT: no such file or directory, open 'index.html', and in the console, I see:

HTML1527: DOCTYPE expected. Consider adding a valid HTML5 doctype: "!DOCTYPE html>".

I have a doctype, though. Before this, I got a 502 error saying that "/sources.txt" (where I will keep hyperlinks for the project) has a Bad Gateway. I assume that this is a problem with the repl.it servers, so that's why I asked this. Please answer ASAP.