运行cocoapods时遇到错误。我成功运行pod update没有任何问题。然后运行Swift 3.0迁移助手。我现在想从我的项目中删除一些pod。我已将它们从pod文件中注释掉，但当我再次运行pod update时，我收到以下错误：
Errno::EEXIST - File exists - /Users/myname/Documents/MyProj/MyProj Dev/ios-app/Pods/Target Support Files/AMPopTip
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.1.0.rc.2/lib/cocoapods/installer/xcode/pods_project_generator/target_installer.rb:92:in `mkdir'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.1.0.rc.2/lib/cocoapods/installer/xcode/pods_project_generator/target_installer.rb:92:in `mkdir'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.1.0.rc.2/lib/cocoapods/installer/xcode/pods_project_generator/target_installer.rb:92:in `create_support_files_dir'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.1.0.rc.2/lib/cocoapods/installer/xcode/pods_project_generator/pod_target_installer.rb:21:in `block in install!'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.1.0.rc.2/lib/cocoapods/user_interface.rb:142:in `message'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.1.0.rc.2/lib/cocoapods/installer/xcode/pods_project_generator/pod_target_installer.rb:19:in `install!'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.1.0.rc.2/lib/cocoapods/installer/xcode/pods_project_generator.rb:155:in `block (2 levels) in install_libraries'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.1.0.rc.2/lib/cocoapods/installer/xcode/pods_project_generator.rb:153:in `each'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.1.0.rc.2/lib/cocoapods/installer/xcode/pods_project_generator.rb:153:in `block in install_libraries'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.1.0.rc.2/lib/cocoapods/user_interface.rb:142:in `message'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.1.0.rc.2/lib/cocoapods/installer/xcode/pods_project_generator.rb:152:in `install_libraries'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.1.0.rc.2/lib/cocoapods/installer/xcode/pods_project_generator.rb:64:in `generate!'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.1.0.rc.2/lib/cocoapods/installer.rb:179:in `block in generate_pods_project'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.1.0.rc.2/lib/cocoapods/user_interface.rb:64:in `section'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.1.0.rc.2/lib/cocoapods/installer.rb:178:in `generate_pods_project'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.1.0.rc.2/lib/cocoapods/installer.rb:115:in `install!'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.1.0.rc.2/lib/cocoapods/command/update.rb:60:in `run'
/Library/Ruby/Gems/2.0.0/gems/claide-1.0.0/lib/claide/command.rb:334:in `run'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.1.0.rc.2/lib/cocoapods/command.rb:50:in `run'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.1.0.rc.2/bin/pod:55:in `<top (required)>'
/usr/local/bin/pod:23:in `load'
/usr/local/bin/pod:23:in `<main>'
我在这里做错了什么想法？任何指针都会非常感激！谢谢！