undefined method `[]' for true:TrueClass

I am getting undefined method [] for true:TrueClass error while running the rake task in acts_as_recommendable plugin. The error points to the following line.

  items = options[:on_class].find(:all开发者_运维问答).collect(&:id)

Can someone please tell what am i doing incorrectly.

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options is probably defined as true. We can't really know why without more information.