BuddyPress.org

i am developing a website using buddypress and after creating the register page, when someone wants to sign up, after typing the info and press the sign up button, this error appears
Fatal error: Call to undefined function bp_get_settings_slug() in /home/yeboah2/public_html/winderrands/wp-content/plugins/buddypress/bp-core/bp-core-filters.php on line 1072

instead of redirecting the new user to the activation page, it doesn”t, that error shows up but on the users page, i see the new user created but the user can’t activate his/her account.
someone kindly help me fix this problem please.
thanks in advance