Paperclip Not Working! Error results!

It is giving me an error for the 'new' and 'create' in the Messages Controller! Please help as I have slaving over this for days to no avail... :( It says:

Paperclip::Error in MessagesController#create Document model missing required attr_accessor for 'attachment_file_name'

My Messages Controller!:

def new @message = Message.new @message.build_document respond_to do |format| format.html # new.html.erb format.json { render json: @message } end end

# GET /messages/1/edit def edit @message = Message.find(params[:id]) end

# POST /messages # POST /messages.json def create @message = Message.new(params[:message])

respond_to do |format|
  if @message.save
    format.html { redirect_to @message, notice: 'Message was successfully created.' }
    format.json { render json: @message, status: :created, location: @message }
  else
    format.html { render action: "new" }
    format.json { render json: @message.errors, status: :unprocessable_entity }
  end
end

end

Here are my other models if that helps!

I have the Document Model:

attr_accessible :attachment, :attachment_file_name has_attached_file :attachment_file_name

I have the Messages (Status) Model:

attr_accessible :content, :user_id, :document_attributes belongs_to :user belongs_to :document accepts_nested_attributes_for :document validates_attachment_content_type :attachment, :content_type => [ 'application/msword', 'application/vnd.openxmlformats-officedocument.wordprocessingml.document' ]