WP Meta SEO무료 버전을 설치했는데 플러그인 탭이 작동하지 않습니다.

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도움 부탁드립니다!
WP Meta SEO 플러그인을 설치했는데 (제 사이트와 호환된다고 했습니다), 플러그인 섹션에서 다음과 같은 치명적인 오류가 발생합니다.
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}에서 발생 /home/paxcommu/public_html/wp-content/plugins/wp-meta-seo/jufeedback/ju-check-debug-data.php 79번째 줄