BuddyPress.org

I don’t know exactly what you did, but the link to the register path is going to a wrong url
http://exaholics.com/?bp_pc_redir_to=%2Fregister
instead of
http://exaholics.com/register/

Control the path of the main site in wp-admin/yoursite ->edit
In the first lines you will see the actual path

View also in your wp-config….