Pdf error

hi everyone i am trying for a pdf report and when i do it i got the
below error.Plz help me
undefined method `header’ for #Prawn::Document:0xb595d098

This is the code where i’m getting error

pdf.header pdf.margin_box.top_left do
if FileTest.exists?("#{RAILS_ROOT}/public/uploads/image/
institute_logo.jpg")
logo = “#{RAILS_ROOT}/public/uploads/image/institute_logo.jpg”
else
logo = “#{RAILS_ROOT}/public/images/application/
app_fedena_logo.jpg”
end
@institute_name=Configuration.get_config_value(‘InstitutionName’);

@institute_address=Configuration.get_config_value(‘InstitutionAddress’);
pdf.image logo, :position=>:left, :height=>50, :width=>50
pdf.font “Helvetica” do
info = [[@institute_name],
[@institute_address]]
pdf.move_up(50)
pdf.fill_color “97080e”
pdf.table info, :width => 400,
:align => {0 => :center},
:position => :center,
:border_color => “FFFFFF”
pdf.move_down(20)
pdf.stroke_horizontal_rule
end
end
i don’t know whats the problem
my GEM list

prawn (0.11.1, 0.8.4)
prawn-core (0.8.4)
prawn-format (0.2.3)
prawn-layout (0.8.4)
prawn-security (0.8.4)

thanks in advance

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