travelation

What is the plugin that you used? please advice?

ok I got this error when I tried to

“Warning: require_once(/home/vol11/byethost10.com/b10_3989427/htdocs/wp-content/plugins/buddypress/bp-core.php) [function.require-once]: failed to open stream: No such file or directory in /home/vol11/byethost10.com/b10_3989427/htdocs/wp-content/plugins/bp-loader.php on line 19”

ops I forget to mention the version of simple forum is 4.1 beta 2