lors de l'installation de pod ,d'ERREUR "Invalid `Podfile fichier: undefined method `plateforme'

Je suis un nouvel ios develper, j'ai besoin d'installer "AFNetworking'.

tout d'abord, j'ai installé cocoapods;

deuxième, j'ai créé un Podfile " dans mon wordspace;

source 'https://github.com/CocoaPods/Specs.git'
platform :ios, '8.0'
pod 'AFNetworking'

ensuite, je lance
pod install
Il y a une ERREUR:

/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/pathname.rb:422:in `open': No such file or directory - /Users/nemo/.cocoapods/repos (Errno::ENOENT)
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/pathname.rb:422:in `foreach'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/pathname.rb:422:in `children'
from /Library/Ruby/Gems/2.0.0/gems/cocoapods-0.35.0/lib/cocoapods/sources_manager.rb:63:in `all'
from /Library/Ruby/Gems/2.0.0/gems/cocoapods-0.35.0/lib/cocoapods/user_interface/error_report.rb:130:in `repo_information'
from /Library/Ruby/Gems/2.0.0/gems/cocoapods-0.35.0/lib/cocoapods/user_interface/error_report.rb:34:in `report'
from /Library/Ruby/Gems/2.0.0/gems/cocoapods-0.35.0/lib/cocoapods/command.rb:58:in `report_error'
from /Library/Ruby/Gems/2.0.0/gems/claide-0.7.0/lib/claide/command.rb:300:in `handle_exception'
from /Library/Ruby/Gems/2.0.0/gems/claide-0.7.0/lib/claide/command.rb:274:in `rescue in run'
from /Library/Ruby/Gems/2.0.0/gems/claide-0.7.0/lib/claide/command.rb:264:in `run'
from /Library/Ruby/Gems/2.0.0/gems/cocoapods-0.35.0/lib/cocoapods/command.rb:45:in `run'
from /Library/Ruby/Gems/2.0.0/gems/cocoapods-0.35.0/bin/pod:43:in `<top (required)>'
from /usr/bin/pod:23:in `load'
from /usr/bin/pod:23:in `<main>'

OriginalL'auteur Zk Liao | 2014-11-26