Rails - Dec 2007 - "Multiple default values" with Rails migration

I am running the following migration with PostgreSQL 8.2.5. It works
fine on my Windows machine, but gives me the below error on Linux
CentOS 4.3. Any ideas? Thanks, Chirag

class CreateUsers < ActiveRecord::Migration
  def self.up
    create_table :uers do |t|
      t.column :timestamp, :timestamp_with_time_zone
      t.column :userval, :integer, :limit => 1, :null=> false #will
use smallint becuase of plug-in
    end
  end

  def self.down
    drop_table :users
  end
end


== CreateUsers: migrating
===============================================-- create_table(:users)
rake aborted!
RuntimeError: ERROR     C42601  Mmultiple default values specified for
column "id" of table "users"        Fanalyze.c      L1216
RtransformColumnDefinition: CREATE TABLE users ("id" serial primary
key DEFAULT NULL, "user_id" integer DEFAULT NULL,
"timestamp" integer
DEFAULT NULL, "userval" smallint NOT NULL)

(See full trace by running task with --trace)

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