Rails - Sep 2007 - Matrix expected, got Fixnum && acts_as_tree?????????

Hello i got this:

class Matrix < ActiveRecord::Base
  set_table_name :matrix

belongs_to :member, :foreign_key=>:userid
acts_as_tree :foreign_key=>:parent
end

class Member < ActiveRecord::Base
  set_primary_key :userid
has_many :matrix, :foreign_key=>:userid
has_many :matrix, :foreign_key=>:parent
has_many :payment, :foreign_key=>:userid
has_many :paymentHistory, :foreign_key=>:userid
validates_presence_of :name
validates_presence_of :identification
validates_presence_of :sponsor
end

i modeled my data like this because each member have more member through
himself.

My problem is when i try to create a new member:
it says: Matrix expected, got Fixnum

but if i erase the ''acts_as_tree'' from matrix model it works
well,
what could be???

to save the data in my controller i got:

 def create
   @member     = Member.new(params[:member])
   @new_matrix = Matrix.new
    respond_to do |format|
      if @member.save
         @new_matrix.userid = @member.userid
         parent = Member.find(params[:matrix]).userid
         @new_matrix.parent = parent
         @new_matrix.save
        flash[:notice] = ''Member was successfully created.''
        format.html { redirect_to member_url(@member) }
        format.xml  { head :created, :location => member_url(@member) }
      else
        format.html { render :action => "new" }
        format.xml  { render :xml => @member.errors.to_xml }
      end
    end
  end

PLeased heeelp mee!
Best Regards,
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