BuddyPress.org

The problem is not being caused by buddypress, if you look closely at the error message, it says “wp-content/plugins/buddypress-kaltura-media-component

I have no idea what that plugin is, but go into your hosts’ file manager, or FTP, and delete that plugin.

If you just can’t live without the plugin, go into the plugins folder, and find the file “bp-media-group.php” and find line 5, and try deleting that line to see if it would fix it.