I get the following Warnings when export contacts after performing an advanced search:
Blockquote Warning: strpos(): Empty needle in /home/iskcohdx/public_html/crm/wp-content/plugins/civicrm/civicrm/CRM/Export/BAO/Export.php on line 600
Blockquote Warning: Cannot modify header information - headers already sent by (output started at /home/iskcohdx/public_html/crm/wp-content/plugins/civicrm/civicrm/CRM/Export/BAO/Export.php:600) in /home/iskcohdx/public_html/crm/wp-content/plugins/civicrm/civicrm/CRM/Utils/System.php on line 833
What could be the cause of this and how to fix this issue? I'm using CiviCRM 4.5.3 on Wordpress.