This error shows up in write / post udnerneath the category area.
When I was intalling the plugin I got another error, the one listed a few post down that was said to be unknown. I am on the newest WP and on PHP 5.
WordPress database error: [Table 'wordpress.wp_aleph_sets' doesn't exist]
SELECT wp_aleph_sets.ID, wp_aleph_sets.owner, wp_aleph_sets. name, wp_term_taxonomy.count, wp_term_taxonomy.description, wp_users.display_name, wp_users.user_nicename FROM wp_aleph_sets INNER JOIN wp_term_taxonomy ON (wp_aleph_sets.term_taxonomy_id = wp_term_taxonomy.term_taxonomy_id) INNER JOIN wp_users ON (wp_users.ID = wp_aleph_sets.owner) WHERE wp_aleph_sets.owner = '1'