Applying ip6tables firewall rules: ip6tables-restore v1.3.5: ip6tables-restore: unable to initializetable 'filter'

For resolving above error or enabling IPv6 find below steps:

1.      Confirm above error, restart/start ip6tables service

# service ip6tables restart

Unloading ip6tables modules:                               [  OK  ]

Applying ip6tables firewall rules: ip6tables-restore v1.3.5: ip6tables-restore: unable to initializetable 'filter'

Error occurred at line: 2

Try `ip6tables-restore -h' or 'ip6tables-restore --help' for more information.

                                                           [FAILED]

2.      Check /etc/modprobe.conf for below parameter:

alias ipv6 off

options ipv6 disable=1

3.      Remove above  parameters from modprobe.conf file

4.      Restart machine.

5.      Now restart/start ip6tables service

# service ip6tables restart

Flushing firewall rules:                                   [  OK  ]

Setting chains to policy ACCEPT: filter                    [  OK  ]

Unloading ip6tables modules:                               [  OK  ]

Applying ip6tables firewall rules:                         [  OK  ]