can't convert nil into String
/usr/local/ruby/1.8/lib/ruby/1.8/pstore.rb:95:in `dirname'
/usr/local/ruby/1.8/lib/ruby/1.8/pstore.rb:95:in `initialize'
matome.rb:58:in `new'
matome.rb:58:in `get_user'
matome.rb:92:in `matome'
matome.rb:214