Error configuring NAT with nftables

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I've used nftables to perform filtering for a while and today I tried to configure it for NAT.

I took the example from nftables wiki [1]:
% nft add table nat
% nft add chain nat prerouting { type nat hook prerouting priority 0 \; }
% nft add chain nat postrouting { type nat hook postrouting priority 0 \; }

The first command completes fine, but the second gives me an error:
# nft add chain nat prerouting { type nat hook prerouting priority 0 \; }
<cmdline>:1:1-66: Error: Could not process rule: No such file or directory
add chain nat prerouting { type nat hook prerouting priority 0 ; }
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Also tried this way:
# nft -f /etc/nftables/ipv4-nat /etc/nftables/ipv4-nat:3:1-2: Error: Could not process rule: No such file or directory
table nat {
^^
/etc/nftables/ipv4-nat:3:1-2: Error: Could not process rule: No such file or directory
table nat {
^^

I'm using nftables 0.3 with kernel 3.16.3. Can you help me with it?


[1] http://wiki.nftables.org/wiki-nftables/index.php/Performing_Network_Address_Translation_%28NAT%29
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