Internal Server Error

Script Error:

Missing Content-type in headers:
Status: 304 Not Modified
X-Powered-By: PHP/5.6.33
X-Pingback: http://marscorrect.com/cgi/wp/xmlrpc.php
Last-Modified: Sun, 04 Mar 2018 01:17:10 GMT
ETag: "40e30ef032ed7016cba3747ec5fa1a23"

Script Output: