Database error after upgrading: wp_post2cat’ doesn’t exist

Hi all, after upgrading WP to 2.3, I wrote a post but on click to ‘Save and continue editing’, or ‘Save’, get next error:

WordPress database error: [Table 'eygigavz_blog.wp_post2cat' doesn't exist]
SELECT cat_ID AS ID, MAX(post_modified) AS last_mod FROM <code>wp_posts</code> p LEFT JOIN <code>wp_post2cat</code> pc ON p.ID = pc.post_id LEFT JOIN <code>wp_categories</code> c ON pc.category_id = c.cat_ID WHERE post_status = 'publish' GROUP BY cat_ID

Warning: Cannot modify header information - headers already sent by (output started at /home/eygigavz/public_html/blog/wp-includes/wp-db.php:160) in /home/eygigavz/public_html/blog/wp-includes/pluggable.php on line 390

wp-db.php lines 144 to 164:

//	Print SQL/DB error.

	function print_error($str = '') {
		global $EZSQL_ERROR;
		if (!$str) $str = mysql_error($this->dbh);
		$EZSQL_ERROR[] =
		array ('query' => $this->last_query, 'error_str' => $str);

		$str = htmlspecialchars($str, ENT_QUOTES);
		$query = htmlspecialchars($this->last_query, ENT_QUOTES);
		// Is error output turned on or not..
		if ( $this->show_errors ) {
			// If there is an error then take note of it
			print "<div id='error'>
			<p class='wpdberror'><strong>WordPress database error:</strong> [$str]<br />
			<code>$query</code></p>
			</div>";
		} else {
			return false;
		}
	}

pluggable.php lines 372 to 395:

// Cookie safe redirect.  Works around IIS Set-Cookie bug.
// http://support.microsoft.com/kb/q176113/
if ( !function_exists('wp_redirect') ) :
function wp_redirect($location, $status = 302) {
	global $is_IIS;

	$location = apply_filters('wp_redirect', $location, $status);

	if ( !$location ) // allows the wp_redirect filter to cancel a redirect
		return false;

	$location = wp_sanitize_redirect($location);

	if ( $is_IIS ) {
		header("Refresh: 0;url=$location");
	} else {
		if ( php_sapi_name() != 'cgi-fcgi' )
			status_header($status); // This causes problems on IIS and some FastCGI setups
		header("Location: $location");
	}
}
endif;

if ( !function_exists('wp_sanitize_redirect') ) :

What can I do?

Thanks all.