wp2.2.1 — плагин Simple Tagging — WordPress database error

Пытаюсь пристроить плагин Simple Tagging к wp 2.2.1

На странице поиска по тагу получаю такие ошибки:

Что они означают-то?
На странице плагина http://wordpress.org/extend/plugins/simple-tagging-plugin/ указано, что плагин совместим с wp 2.2 🙁

WordPress database error: [Illegal mix of collations (cp1251_general_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation ' IN ']
SELECT SQL_CALC_FOUND_ROWS wp_posts.* FROM wp_posts LEFT JOIN wp_stp_tags AS stptags ON (wp_posts.ID = stptags.post_id) WHERE 1=1 AND (post_type IN('page', 'post') AND (post_status IN('static', 'publish') OR post_status = 'private')) AND stptags.tag_name IN ('свежие яблоки') GROUP BY wp_posts.ID HAVING COUNT(ID) = 1 ORDER BY post_date DESC LIMIT 0, 3

WordPress database error: [Illegal mix of collations (cp1251_general_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation ' IN ']
SELECT COUNT(DISTINCT ID) FROM wp_posts LEFT JOIN wp_stp_tags AS stptags ON (wp_posts.ID = stptags.post_id) WHERE 1=1 AND (post_type IN('page', 'post') AND (post_status IN('static', 'publish') OR post_status = 'private')) AND stptags.tag_name IN ('свежие яблоки')

WordPress database error: [Illegal mix of collations (cp1251_general_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation ' IN ']
SELECT COUNT(DISTINCT ID) FROM wp_posts LEFT JOIN wp_stp_tags AS stptags ON (wp_posts.ID = stptags.post_id) WHERE 1=1 AND (post_type IN('page', 'post') AND (post_status IN('static', 'publish') OR post_status = 'private')) AND stptags.tag_name IN ('свежие яблоки')