Fatal error: Uncaught Error: Call to undefined function mpd_get_posts_source_post() in C:\xampp\apps\wordpress\htdocs\wp-content\themes\cavere\header.php:73 Stack trace: #0 C:\xampp\apps\wordpress\htdocs\wp-includes\template.php(688): require_once() #1 C:\xampp\apps\wordpress\htdocs\wp-includes\template.php(647): load_template('C:\\xampp\\apps\\w...', true) #2 C:\xampp\apps\wordpress\htdocs\wp-includes\general-template.php(41): locate_template(Array, true) #3 C:\xampp\apps\wordpress\htdocs\wp-content\themes\cavere\_tpl\_tpl_standard-post.php(1): get_header() #4 C:\xampp\apps\wordpress\htdocs\wp-content\themes\cavere\single.php(20): include('C:\\xampp\\apps\\w...') #5 C:\xampp\apps\wordpress\htdocs\wp-includes\template-loader.php(74): include('C:\\xampp\\apps\\w...') #6 C:\xampp\apps\wordpress\htdocs\wp-blog-header.php(19): require_once('C:\\xampp\\apps\\w...') #7 C:\xampp\apps\wordpress\htdocs\index.php(17): require('C:\\xampp\\apps\\w...') #8 {main} thrown in C:\xampp\apps\wordpress\htdocs\wp-content\themes\cavere\header.php on line 73