Updates Broke My Site

Your plugin has worked for years and today, I am experiencing this problem.

I can’t even delete the new plugin and upload 4.5 without the following error appearing at the top of the screen on my backend.

Warning: Cannot modify header information – headers already sent by (output started at /home/*****/public_html/wp-content/plugins/delete-duplicate-posts/delete-duplicate-posts.php:1609) in /home/conserva/public_html/wp-includes/functions.php on line 6360

Warning: Cannot modify header information – headers already sent by (output started at /home/*****/public_html/wp-content/plugins/delete-duplicate-posts/delete-duplicate-posts.php:1609) in /home/conserva/public_html/wp-admin/includes/misc.php on line 1310

Warning: Cannot modify header information – headers already sent by (output started at /home/*****/public_html/wp-content/plugins/delete-duplicate-posts/delete-duplicate-posts.php:1609) in /home/conserva/public_html/wp-admin/admin-header.php on line 9