# Startup 1. If you run into the `MODULE_NOT_FOUND` or `No such file or directory` error, then you either don't have the files uploaded or the correct file name, set in the "Startup" tab.

2. To fix the error, you want to head to the "Startup" tab and change `The file that starts the app` to your startup file such as index.js, app.js, main.js, script.js or file.js or whatever it is. For python, do the same, main.py, index.py, app.py, script.py, etc. If it's in a folder, simply do `foldername/FILENAME` and you are simply done!

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