rake throws an error: undefined method `reserved=' for #<FriendlyId

I run rake and I get this error. What's that supposed to mean? Sorry I'm newbie to RoR sb please help. Thanks a lot.

undefined method `reserved=' for #<FriendlyId::Act开发者_JAVA百科iveRecordAdapter::Configuration:0x2b1ae5c2ec70>

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You have to use reserved_words instead of reserved.

There was a code change in recent versions of friendly_id.

http://norman.github.com/friendly_id/FriendlyId/Configuration.html#reserved_words-instance_method

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may be you are using reserved= instead of reserved on your FriendlyId object.