[Solved] HTML and PHP form not working, returning error even when correct info has been put in

I made a HTML and PHP form. The form looks good, I fill in all the details, but then it does not allow me to submit it.

For some reason it is dying every time even when the info is correct.

Here is the repo: https://github.com/GiacomoLaw/web-form

Here is a live demo: http://if-charts.890m.com/web-form-master/

Thank you!