code cleanup

I am tossed an error by errormailer every time a new record is saved to my 'referral_notes' model. The record is saved and the problem is simply the informational error message that I am sent but I don't get this type of thing happening anywhere else in my application.

This is the error reported by ErrorMailer...

Message undefined method `stringify_keys!' for # Location /referral_notes/create?commit= +Create+&referral_note=noteT%2FC +from+BPI+re+Ct+status.+Per+Eulene% 2C+Ct+is+currently+at+the+Biltmore +completing+paperwork+and+the%0D% 0Ateam+is+requesting+that+Ct+move+in +9%2F28%2F07.+Spoke+with+PC+who +confirmed+that+Ct+may+move+in+9% 2F28%2F07.%0D%0AFaxed+acceptance+to +BPI+this +date.+note_date2007-09-27&placement_id=779 Action create Controller referral_notes Query commit=+Create+&referral_note=noteT% 2FC+from+BPI+re+Ct+status.+Per +Eulene%2C+Ct+is+currently+at+the +Biltmore+completing+paperwork+and +the%0D%0Ateam+is+requesting+that+Ct +move+in+9%2F28%2F07.+Spoke+with+PC +who+confirmed+that+Ct+may+move+in +9%2F28%2F07.%0D%0AFaxed+acceptance +to+BPI+this +date.+note_date2007-09-27&placement_id=779 Method GET

[:referral_note][:note] field is a text_area field but obviously each individual work is strung together.

The view code looks like this...

  <%= start_form_tag :action => 'create',    :placement_id => params[:placement_id] %>

    <td><%= toolbocks_date_select('referral_note', 'note_date') %></td>     <td><%= text_area 'referral_note', 'note',         :rows => '4', :columns => '256' %></td>

  <div align="center"><hr><%= submit_tag ' Create ' %>   <%= end_form_tag %></div>

and the place in the controller code (very benign) where this ErrorMailer message is generated is

  def create     @referral_note = ReferralNote.new(params[:referral_note])   ...   end

What am I missing?