I ran into so possible reason recently. Because Linux is case sensitive. So if you're making server software locally you can easily run into a bug where you ref

I ran into so possible reason recently. Because Linux is case sensitive. So if you're making server software locally you can easily run into a bug where you reference "SomeFile" in your build/package/website locally but on disk it's named "Somefile". Everything works. Then you push to your server and things break. I'm not going to switch my laptop to be case sensitive but I did just run into that issue.