Rails - May 2012 - Active Admin help

I have installed active admin and also add my model -controller 
rate_professor there.......I can add/delete/edit data using active admin 
...but if I click on submit button of my form in rate_professor controller 
... I can see whatever I added in the index page ........but I don''t
want
to see that one.....I want to find the information(whatever I added by 
clicking submit button)  on the website after reviewing by admin.......Can 
anyone please help me to fix this.......?It will be great...... here are my 
codes..

in rate_professors controller:(1:n relationship)
 def create
       @professor=Professor.find(params[:id])
        @rate_professor 
=@professor.rate_professors.build(params[:rate_professor])
       if @rate_professor.save 
      redirect_to rate_professors_index_path(:id=> @professor.id)
       end
  end
end

 def index
     
        @professor=Professor.find(params[:id])
          @rate_professor =@professor.rate_professors.build
  end
         

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ActiveRecord::RecordNotUnique in Admin::AdminUsersController#create

ODBC::Error: 23000 (2601) [unixODBC][FreeTDS][SQL Server]Cannot insert 
duplicate key row in object ''dbo.admin_users'' with unique
index
''index_admin_users_on_reset_password_token''.: EXEC
sp_executesql
N''INSERT INTO [admin_users] ([created_at], [current_sign_in_at], 
[current_sign_in_ip], [email], [encrypted_password], [last_sign_in_at], 
[last_sign_in_ip], [remember_created_at], [reset_password_sent_at], 
[reset_password_token], [sign_in_count], [updated_at]) VALUES (@0, @1, 
@2, @3, @4, @5, @6, @7, @8, @9, @10, @11); SELECT CAST(SCOPE_IDENTITY() 
AS bigint) AS Ident'', N''@0 datetime, @1 datetime, @2
nvarchar(255), @3
nvarchar(255), @4 nvarchar(255), @5 datetime, @6 nvarchar(255), @7 
datetime, @8 datetime, @9 nvarchar(255), @10 int, @11 datetime'', @0 = 
''2012-05-28T14:47:04.490'', @1 = NULL, @2 = NULL, @3 = 
N''marconeto83-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org'', @4 =
N'''', @5 = NULL, @6 = NULL, @7 = NULL, @8
= NULL, @9 = NULL, @10 = 0, @11 = ''2012-05-28T14:47:04.490''


error in create new user

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