disqus plugin edit screw up

I’m in trouble. I was editing the disqus plugin to remove or hide the disqus dislike button. But I have seem to screw up. I get this error. Please take a look and let me know how to resolve this.

Warning: Cannot modify header information – headers already sent by (output started at /home/irfarios/public_html/wp-content/plugins/disqus-comment-system/disqus.php:1484) in /home/irfarios/public_html/wp-content/plugins/wp-super-cache/wp-cache-phase2.php on line 78