BuddyPress.org

Ok, I’ve installed Buddypress onto a theme that I’m building from scratch. When I attempt to go to a profile page, or anything for that matter in relation to buddypress, I get the following error:

Fatal error: Class ‘WP_Post’ not found in public_html/iwf/wp-content/plugins/buddypress/bp-core/bp-core-theme-compatibility.php on line 443

Any ideas of what needs to be done to rectify the issue? Any help would be gratefully appreciated. Thanks!