Product theme, i got this error message.

when i installed Product theme i gor this error message.

Fatal error: Cannot redeclare bp_dtheme_ajax_querystring() (previously declared in /web/coup/www.co-up.com/wp-content/plugins/buddypress/bp-themes/bp-default/_inc/ajax.php:20) in /web/coup/www.co-up.com/wp-content/themes/product/_inc/ajax.php on line 63

and

Warning: fopen(/web/coup/www.co-up.com/wp-content/themes/product-1.9.1/style.css) [function.fopen]: failed to open stream: No such file or directory in /web/coup/www.co-up.com/wp-includes/functions.php on line 4165

Warning: fread(): supplied argument is not a valid stream resource in /web/coup/www.co-up.com/wp-includes/functions.php on line 4168

Warning: fclose(): supplied argument is not a valid stream resource in /web/coup/www.co-up.com/wp-includes/functions.php on line 4171