Ruby on Rails

I'm sure this is total newb (since I am pretty newb) but I'm curious what the issue is here. I attempt to role back all my migrations which I'm doing with

rake db:migrate VERSION=0
(in /Users/rick/projects/rails/sillymeters)
==  CreateSessions: never migrated, skipping ==================================

==  CreateUsers: reverting ====================================================
-- drop_table(:users)
   -> 0.0011s
==  CreateUsers: reverted (0.0012s) ===========================================

==  CreateMeters: reverting ===================================================
-- drop_table(:meters)
   -> 0.0008s
==  CreateMeters: reverted (0.0009s) ==========================================

etc..

Note the first one says "CreateSessions: never migrated, skipping"

When I then go to run the migrations, most go through fine, but then  I get the following error when it tries to run the CreateSessions migration:

 ~/projects/rails/sillymeters(master) $ rake db:migrate
(in /Users/rick/projects/rails/sillymeters)
==  CreateSessions: migrating =================================================
-- create_table(:sessions)-
rake aborted!
An error has occurred, this and all later migrations canceled:

SQLite3::SQLException: table "sessions" already exists: CREATE TABLE "sessions" ("id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, "session_id" varchar(255) NOT NULL, "data" text, "created_at" datetime, "updated_at" datetime)


I'm assuming that each application has its own instance of SQLLite so I'm curious how this error is occurring or what I need to do to fix it. I 'think' I might be getting this because it's possible I did at one point have a similar migration that created the Session table, but then I deleted that migration and created it as a new one with a new name. The table name was the same though "sessions" so I don't get what is going on.

The migration in question looks like:

class CreateSessions < ActiveRecord::Migration
  def self.up
    create_table :sessions do |t|
      t.string :session_id, :null => false
      t.text :data
      t.timestamps
    end

    add_index :sessions, :session_id
    add_index :sessions, :updated_at
  end

  def self.down
    drop_table :sessions
  end
end

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