[arch-general] Failed to upgrade!!

hi, When i tried to run "sudo pacman -Syu" today got the following output. [papul@papuldesktop ~]$ sudo pacman -Syu :: Synchronizing package databases... core is up to date extra is up to date community is up to date catalyst is up to date multilib is up to date :: Starting full system upgrade... resolving dependencies... looking for inter-conflicts... error: failed to prepare transaction (could not satisfy dependencies) :: lib32-hal: requires lib32-dbus Why cant i upgrade?? How do i install the mentioned dependency 'lib32-dbus'? Thanks.