Affiliate Plugin ERRORS

we just got this plugin, installed an got the following errors:

Warning: substr_compare() [function.substr-compare]: The length cannot exceed initial string length in /home/learning/public_html/wp-content/plugins/affiliate/affiliateincludes/classes/affiliateadmin.php on line 2215

Warning: Cannot modify header information - headers already sent by (output started at /home/learning/public_html/wp-content/plugins/affiliate/affiliateincludes/classes/affiliateadmin.php:2215) in /home/learning/public_html/wp-includes/functions.php on line 861

Warning: Cannot modify header information - headers already sent by (output started at /home/learning/public_html/wp-content/plugins/affiliate/affiliateincludes/classes/affiliateadmin.php:2215) in /home/learning/public_html/wp-includes/functions.php on line 862

Whats the deal??