Rails for Zombies Level 2 Challenge 4

I'm not sure how to solve this. I tried rewatching the videos but it doesn't say how to link "presence" and "uniqueness" validations to zombie's name. Any suggestions?

Picture here: http://i.stack.imgur.com/2nAEs.pn开发者_StackOverflow社区g

Thanks

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Simple as

validates :name, :presence => true, :uniqueness => true

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it is giving this error on typing above code ArgumentError: You need to supply at least one validation