Installerede gratisversionen af WP Meta SEO, men plugin-fanen gik i stykker.

Hej,
jeg har brug for hjælp, tak!
Jeg installerede WP Meta SEO (den sagde, at den var kompatibel med mit websted), og nu har plugin-sektionen en fatal besked:
Fatal error: Uncaught Error: Call to undefined function get_user_locale() in /home/paxcommu/public_html/wp-content/plugins/wp-meta-seo/jufeedback/ju-check-debug-data.php:79 Stack trace: #0 [internal function]: JuCheckDebugData::debugData() #1 /home/paxcommu/public_html/wp-content/plugins/wp-meta-seo/jufeedback/jufeedback.php(194): call_user_func('JuCheckDebugDat...') #2 /home/paxcommu/public_html/wp-includes/plugin.php(524): Joomunited\WPMetaSEO\Jufeedback\Jufeedback::screenFeedback(Object(WP_Screen)) #3 /home/paxcommu/public_html/wp-admin/includes/class-wp-screen.php(393): do_action('current_screen', Object(WP_Screen)) #4 /home/paxcommu/public_html/wp-admin/includes/screen.php(232): WP_Screen->set_current_screen() #5 /home/paxcommu/public_html/wp-admin/admin.php(187): set_current_screen() #6 /home/paxcommu/public_html/wp-admin/plugins.php(10): require_once('/home/paxcommu/...') #7 {main} smidt i /home/paxcommu/public_html/wp-content/plugins/wp-meta-seo/jufeedback/ju-check-debug-data.php på linje 79