Error message

• Warning: Cannot modify header information - headers already sent by (output started at /var/www/vhosts/syrianboard.sy/httpdocs/includes/common.inc:2726) in drupal_send_headers() (line 1233 of /var/www/vhosts/syrianboard.sy/httpdocs/includes/bootstrap.inc).
• PDOException: SQLSTATE[42000]: Syntax error or access violation: 1142 UPDATE command denied to user 'verso'@'localhost' for table 'variable': UPDATE {variable} SET value=:db_update_placeholder_0 WHERE ( (name = :db_condition_placeholder_0) ); Array ( [:db_update_placeholder_0] => i:1524706577; [:db_condition_placeholder_0] => cron_last ) in variable_set() (line 992 of /var/www/vhosts/syrianboard.sy/httpdocs/includes/bootstrap.inc).