Blackfyre PM Issue

Hey Guys, when i enable the buddypress pm, it crashes my website with the attached

Fatal error: Uncaught Error: Call to undefined function bp_friend_get_total_requests_count() in C:\xampp\htdocs\wp-content\themes\blackfyre\header.php:91 Stack trace: #0 C:\xampp\htdocs\wp-includes\template.php(688): require_once() #1 C:\xampp\htdocs\wp-includes\template.php(647): load_template(‘C:\\xampp\\htdocs…’, true) #2 C:\xampp\htdocs\wp-includes\general-template.php(41): locate_template(Array, true) #3 C:\xampp\htdocs\wp-content\themes\blackfyre\tmp-no-title.php(6): get_header() #4