php Warnings after using revision removal pluggin

I used pluggin revision-removal and I now have this text on the top of every page. Please can you help me with the removal of this? Thanks.
website: arcor-inc.com

Warning: Cannot modify header information – headers already sent by (output started at /home/content/05/7158605/html/wp-content/plugins/revision-removal/revision-removal.php:1) in /home/content/05/7158605/html/wp-content/plugins/wp-super-cache/wp-cache-phase2.php on line 88

Warning: session_start() [function.session-start]: Cannot send session cache limiter – headers already sent (output started at /home/content/05/7158605/html/wp-content/plugins/revision-removal/revision-removal.php:1) in /home/content/05/7158605/html/wp-content/themes/Tersus/functions.php on line 1

http://ww.wp.xz.cn/extend/plugins/revision-removal/