Getting "RTNETLINK answers File exists" on Ubuntu

[muneebkalathil]

When I am running these script on terminal

modprobe ipv6
ip tunnel add he-ipv6 mode sit remote 216.218.221.42 local 192.168.1.36 ttl 255
ip link set he-ipv6 up
ip addr add 2001:470:35:eba::2/64 dev he-ipv6
ip route add ::/0 dev he-ipv6
ip -f inet6 addr

I am gettting an error  "RTNETLINK answers File exists" after executing ip route add ::/0 dev he-ipv6

Running on Ubuntu 14.04.1

Please helpp ..

Thank You