Contact_process.php error

Hello, I am using the dronephotography template. When a user sends a message on from contact.html, php sends an error.

jquery-1.12.4.min.js:4 POST 500 (Internal Server Error)
send @ jquery-1.12.4.min.js:4
ajax @ jquery-1.12.4.min.js:4
$.fn.ajaxSubmit @ jquery.form.js:223
submitHandler @ contact.js:58
s @ jquery.validate.min.js:2
(anonymous) @ jquery.validate.min.js:2
dispatch @ jquery-1.12.4.min.js:3
r.handle @ jquery-1.12.4.min.js:3

hey there!
they make this air problems. can you please provide access status to your website to provide better support?