Error message

• Warning: Cannot modify header information - headers already sent by (output started at /var/www/vhosts/zero3it.com/httpdocs/includes/common.inc:2561) in drupal_send_headers() (line 1040 of /var/www/vhosts/zero3it.com/httpdocs/includes/bootstrap.inc).
• PDOException: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'w.block' in 'where clause': SELECT w.*, n.title AS title FROM {webform} w LEFT OUTER JOIN {node} n ON w.nid = n.nid WHERE (w.block = :db_condition_placeholder_0) AND (n.type IN (:db_condition_placeholder_1, :db_condition_placeholder_2)) ; Array ( [:db_condition_placeholder_0] => 1 [:db_condition_placeholder_1] => page [:db_condition_placeholder_2] => story ) in webform_block_info() (line 1576 of /var/www/vhosts/zero3it.com/httpdocs/sites/all/modules/webform/webform.module).