Couldn't find without an ID

hello , i have problem when i want to show page after user submit data into database. this is code in controller

class ComponentsController < ApplicationController

  def index   end

  def databases     @title = "Database"     if request.post?and params[:seq]       params[:seq][:sequence].gsub!(/\s/,"")       params[:seq][:sequence].upcase!       @seq = Seq.new(params[:seq])       if @seq.save         flash[:notice] = "sequence submitted !"         redirect_to :action => "show"       end     end   end

  def show     @title = "Show"     @seq = Seq.find(params[:id])     end   end end

when i run i have error like is

ActiveRecord::RecordNotFound in ComponentsController#show Couldn't find Seq without an ID /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/ base.rb:1572:in `find_from_ids' /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/ base.rb:616:in `find' /home/apple/www/rcc_eri/app/controllers/components_controller.rb:29:in `show'

thank you very much Reinhart it’ work. -___-