GNOME - Network suddenly stopped working

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https://bbs.archlinux.org – Installed Arch for the first time a few days agoI installed it with GNOME and everything was working fine till yesterday. Today, I didn't see network manager applet and got the error " The system network services are not compatible with this version". I thought this was a problem with the daemons so I added networkmanager to /etc/rc.conf and now the network manager starts but fails. The log said "Failed. Disconnecting. Reason=none)" I don't know why this happened out of a sudden.more details : I regenerated linux.preset using mkinitpcio yesterday swapnil360 (HowTos)