BuddyPress.org

For 1.5 RC1 the file that had the error was “~/wp-content/plugins/buddypress/bp-members/bp-members-notifications.php”
For 1.2.10 the file was “~/wp-content/plugins/buddypress/bp-core/bp-core-notifications.php”.

I had the error first with 1.2.10 then tried and upgrade to 1.5 RC1, both versions had the same error but for different files.
I happy that my contents of the entire /buddypress/ directory are correct for 1.5 RC1. I’m now using 1.5 RC1.