Couldn't find without an ID

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

class ComponentsController < ApplicationController

  def index

  def databases
    @title = "Database"
    if params[:seq]
      @seq =[:seq])
        flash[:notice] = "sequence submitted !"
        redirect_to :action => "show"

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

when i run i have error like is

ActiveRecord::RecordNotFound in ComponentsController#show
Couldn't find Seq without an ID
base.rb:1572:in `find_from_ids'
base.rb:616:in `find'

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