Error on Update Linkroll

I installed and activated the Update Linkroll plugin but once activated I started getting this is coming up at the top of the page: Warning: Cannot modify header information – headers already sent by (output started at /home/kissmegr/public_html/blog/wp-content/plugins/updatelinkroll.php:1) in /home/kissmegr/public_html/blog/wp-admin/link-manager.php on line 567

Sometimes multiple times with various line numbers. I have no idea what the problem is. Has anyone seen this before or know how to fix it? Any help would be greatly appreciated.