REST in rails 1.2.5

I am using rails 1.2.5 And as part of learning rails I just create
a model Person and migrated it (I am following the REST for rails 2
tutorial from peepcode) Then did ./script/generate scaffold Person

 Now inside config/routes.rb  added map.resources :people

In people controller index action
def index
@person_pages, @people = paginate :people, :per_page => 10
respond_to do |format|
format.xml { render :xml => @people }
And also have the view file Now when http://localhost:3000/people
I get the data displayed But when
http://localhost:3000/people.xml I get

XML Parsing Error: unclosed token
Location: http://localhost:3000/people.xml
Line Number 1, Column 1:

          could you please tell why this error happens?Also is there

huge differnece in REST for rails 1.2.5 and 2.x

Thanks in advance