I was having problems with this challenge as well but was able to pass the tests after reading this thread.
While I was writing down my solution I found that I still could not identify the problem.
The first time I visited the link to Glitch(https://glitch.com/#!/import/github/freeCodeCamp/boilerplate-express/) from the introduction page(https://learn.freecodecamp.org/apis-and-microservices/basic-node-and-express), I landed on a project page that did not have a myApp.js file. After I found this thread and visited the link provided by @zdflower I landed on a project page that had a myApp.js file. I checked the URL’s for both links and they are the same. Maybe there is a problem with Glitch?
Additionally, I signed up for a Glitch account after visiting the link to the project the first time and had to visit it a second time to start coding. Maybe there was a problem with something cache/cookie related? I’m not sure what the problem is, but if the Glitch link you follow doesn’t have a myApp.js file, try another browser or clearing your cache and let us know if you’re still having an issue.