SQL Error : SELECT * FROM mwsblog_archive WHERE archive_id=43

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /var/www/localhost/htdocs/step_blog_ver2/php_func/sql_func_my.inc on line 79

Warning: Cannot modify header information - headers already sent by (output started at /var/www/localhost/htdocs/step_blog_ver2/php_func/sql_func_my.inc:59) in /var/www/localhost/htdocs/step_blog_ver2/php/archive.php on line 20