Ruby on Rails

Hi, This seems to be a very small error but I cannot find any solution
to this problem.. I am trying to use the CSV gem in my rails(3.2)
application(ruby 1.9.3) and I am getting an error "NoMethodError". My
controller is:
require 'csv'

def import
file = params[:file] <-- error
CSV.parse(file, :headers => false) do |row|
Event.new(:Ename => row[0], :Edate => row[1], :Elocation =>
row[2], :Edesc => row[3], :Oname => row[4], :Oemail => row[5], :Odetail
=> row[6])
end
end

I am getting this file from a view where the users can upload the csv
file. I am getting a NoMethodError(undefined method 'nil' for
nil:NilClass). My best guess is I am using this method wrong, but then
my next question is how to parse the Csv data? I want to retrieve the
file from my view and then parse the data into the database. How can I
open the file for the same? Is the above method not correct?

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