회원관리 플러그인 사용하고자 체험판을 신청했는데, 아래와 같은 에러가 발생하네요.

Fatal error: Uncaught Error: Call to a member function add_rewrite_tag() on null in /home1/사용자명/wp-includes/rewrite.php:176 Stack trace: #0 /home1/사용자명/wp-includes/class-wp-post-type.php(601): add_rewrite_tag('%cosmosfarm_pro...', '([^/]+)', 'cosmosfarm_prod...') #1 /home1/사용자명/wp-content/plugins/cosmosfarm-members/cosmosfarm-members.php(465): WP_Post_Type->add_rewrite_rules() #2 /home1/사용자명/wp-content/plugins/cosmosfarm-members/cosmosfarm-members.php(1509): cosmosfarm_members_register_post_type_product() #3 /home1/사용자명/wp-content/plugins/cosmosfarm-members/cosmosfarm-members.php(1427): cosmosfarm_members_activation_execute() #4 /home1/사용자명/wp-includes/class-wp-hook.php(292): cosmosfarm_members_update_check('') #5 /home1/사용자명/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters(NULL, Array) #6 /home1/사용자명/wp-includes/plugin.php(484): WP_Hook->do_action(Array) #7 /home1/사용자명/wp-settings.php(423): do_action('plugins_loaded') #8 /home1/사용자명/wp-config.php(96): in /home1/사용자명/wp-includes/rewrite.php on line 176

아래는 위 기재된 rewrite.php 파일 확인한 소스라인 입니다. (162 ~ 176 line)

function add_rewrite_tag( $tag, $regex, $query = '' ) { // 162 line
    // Validate the tag's name.
    if ( strlen( $tag ) < 3 || '%' !== $tag[0] || '%' !== $tag[ strlen( $tag ) - 1 ] ) {
        return;
    }

    global $wp_rewrite, $wp;

    if ( empty( $query ) ) {
        $qv = trim( $tag, '%' );
        $wp->add_query_var( $qv );
        $query = $qv . '=';
    }

    $wp_rewrite->add_rewrite_tag( $tag, $regex, $query ); //176 line
} // 177 line

뭐가 문제인지 잘 모르겠습니다.