unable to export CSV

I installed the plugin and its working fine but, I need to export the subscribers and I’m getting the following error.

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Tyler’s Light
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Warning: Cannot modify header information – headers already sent by (output started at /home/tylerslight/public_html/wp-admin/includes/template.php:1812) in /home/tylerslight/public_html/wp-content/plugins/email-pick-up/views/admin.php on line 41

Warning: Cannot modify header information – headers already sent by (output started at /home/tylerslight/public_html/wp-admin/includes/template.php:1812) in /home/tylerslight/public_html/wp-content/plugins/email-pick-up/views/admin.php on line 42

Warning: Cannot modify header information – headers already sent by (output started at /home/tylerslight/public_html/wp-admin/includes/template.php:1812) in /home/tylerslight/public_html/wp-content/plugins/email-pick-up/views/admin.php on line 43

Warning: Cannot modify header information – headers already sent by (output started at /home/tylerslight/public_html/wp-admin/includes/template.php:1812) in /home/tylerslight/public_html/wp-content/plugins/email-pick-up/views/admin.php on line 44
Email,”Date Added”,Refer [email protected],”2014-07-16 18:08:36″,”Main List”
Warning: Cannot modify header information – headers already sent by (output started at /home/tylerslight/public_html/wp-admin/includes/template.php:1812) in /home/tylerslight/public_html/wp-content/plugins/email-pick-up/views/admin.php on line 57

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