"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