From: William Crawford <wccrawford@...>
Date: 2006-09-06T00:30:23+09:00
Subject: Re: Superclass mismatch

Gareth Adams wrote:
> Hope someone can help work out what I'm doing wrong,
> Gareth

Changing your example slightly shows what could be the problem:

class QuestionnaireAnswerError < ArgumentError
  attr_accessor :question_id

  def initialize(*args)
    self.question_id = args.shift
    super(args)
  end
end

class BadAnswerCountError < QuestionnaireAnswerError
end

class TooManyAnswersError < BadAnswerCountError
end

class TooManyAnswersError < QuestionnaireAnswerError
end

It looks like you've tried to define the class twice with different 
super classes.

HTH

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