Rails - Jul 2005 - Problems uploading files

When I try and upload files to my application I receive this error,  
does anyone understand what this means? I would greatly appreciate  
some help even understanding what this error message means. Thanks in  
advance.

NoMethodError in Sellers#add_file

undefined method `submit='' for #<Document:0x259a56c>
app/controllers/sellers_controller.rb:120:in `new''
app/controllers/sellers_controller.rb:120:in `add_file''
/Users/olly/Sites/development/auctionhand/trunk/script/server:48


Controller code

def add_file
   # If the form has been sent
     if request.post?
       params[''name''] = @params[''document''] 
[''tmp_file''].original_filename.gsub(/[^a-zA-Z0-9.]/,
''_'')
       params[''content''] =
@params[''document''][''tmp_file''].read
       params[''size''] =
@params[''document''][''tmp_file''].length

       ext_array = params[''name''].split(''.'')
       extention = ext_array.pop

       @doctype = Doctype.find(:first,
                                 :conditions => ["extention = ?",  
extention])
       if @doctype
         params[''doctype_id''] = @doctype.id
       else
         params[''doctype_id''] = 1
       end

       params[''seller_id''] = ''1''

      
@params[''document''].delete(''tmp_file'')

       @document = Document.new(params)
     end
   end



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