Trying to install BuddyPress and getting Fatal Error!!!!

I am attempting to install BuddyPress 1.1.3 on a different blog to the main blog (i.e. social,
I have followed the instructions and created a bp-custom.php file in wp-content/plugins defining the blog.

When I attempt to view the blog I gat the following error: Fatal error: Call to undefined function bp_page_title() in .../wp-content/themes/bp-sn-parent/header.php on line 9

I am using the BuddyPress default theme but also get the problem with other BuddyPress themes.

I am new to this and would really appreciate any help.
Thanks :slight_smile: