WP Categories

I've below error message in my "error_log". What should I do now? Thanks.

[15-Jul-2011 09:01:47] WordPress database error Table 'wp_sitecategories' already exists for query CREATE TABLE wp_sitecategories (
cat_ID bigint(20) NOT NULL auto_increment,
cat_name varchar(55) NOT NULL default '',
category_nicename varchar(200) NOT NULL default '',
last_updated timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP,
PRIMARY KEY (cat_ID),
KEY category_nicename (category_nicename),
KEY last_updated (last_updated)
); made by include, do_action, call_user_func_array, global_site_tags_make_current, global_site_tags_global_install, m_wpdb->query