dns expected end of command

RouterOS General
1

Good evening!

I type this command in RouteBOARDr 450G
“/ip dns set primary-dns=212.27.150.4”

the response was “expected end of command (line 1 column 13)”

2

That’s not a valid command.
http://wiki.mikrotik.com/wiki/Manual:IP/DNS#Description

/ip dns set servers=212.27.150.4
3

Thanks!