Missing "+@" method

I'm working on getting some data imported to my database from a CSV
file. Here's the code:

def import_assets(path)
  r = 0
  CSV.foreach(path) do |row|
    b = Asset.new
    #populate the fields, etc
  puts "Imported #{r} assets."

My other import methods worked fine for all my other models, but when I
run this one, it throws a NoMethodError on the line where I create the
new Asset, and it says there's no "+@" method for the new Asset. I've
also tried to define the method, but that doesn't help. I'm running
rails 3.0.5, ruby 1.9.2.

the ++ operator doesn't exist in ruby.