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# Changing your startup file
In this guide I will show you how to identify if this is needed and how to do it
1. If your getting the following error it means ether you don't have your files uploaded or your file goes by a different name
NodeJS version of error
Python version of error
2. Fixing the problem, First go to the startup tab
3. Changing the startup file
You will want to change this file to whatever your mail file is, The most common versions are `foldername/index.js` if its in a folder for example the dist folder would make it `dist/index.js` (or app.py if its python) or `main.py`/`main.js`
