cocoapods 使用中遇到的错误又一解决

出错情况

执行下面语句时

pod install

出现下面错误

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### Report

* What did you do?

* What did you expect to happen?

* What happened instead?

### Stack

```
CocoaPods : 0.30.0
Ruby : ruby 2.0.0p247 (2013-06-27 revision 41674) [universal.x86_64-darwin13]
RubyGems : 2.0.3
Host : Mac OS X 10.9.1 (13B42)
Xcode : 5.1 (5B130a)
Ruby lib dir : /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib
Repositories : master - https://github.com/CocoaPods/Specs.git @ 0f50be2f697b7a905a448b5790e1cd4b1566db65
```

### Podfile

```ruby
platform :ios, '7.0'
pod "AFNetworking", "~> 2.0"
```

### Error

```
Psych::SyntaxError - (/Users/gewara/.cocoapods/repos/master/CocoaPods-version.yml): mapping values are not allowed in this context at line 3 column 4
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/psych.rb:205:in `parse'
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/psych.rb:205:in `parse_stream'
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/psych.rb:153:in `parse'
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/psych.rb:129:in `load'
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/psych.rb:299:in `block in load_file'
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/psych.rb:299:in `open'
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/psych.rb:299:in `load_file'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-0.30.0/lib/cocoapods/sources_manager.rb:262:in `version_information'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-0.30.0/lib/cocoapods/sources_manager.rb:223:in `repo_compatible?'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-0.30.0/lib/cocoapods/sources_manager.rb:282:in `master_repo_functional?'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-0.30.0/lib/cocoapods/command.rb:39:in `parse'
/Library/Ruby/Gems/2.0.0/gems/claide-0.5.0/lib/claide/command.rb:243:in `parse'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-0.30.0/lib/cocoapods/command.rb:38:in `parse'
/Library/Ruby/Gems/2.0.0/gems/claide-0.5.0/lib/claide/command.rb:275:in `run'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-0.30.0/lib/cocoapods/command.rb:51:in `run'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-0.30.0/bin/pod:33:in `<top (required)>'
/usr/bin/pod:23:in `load'
/usr/bin/pod:23:in `<main>'
```

google 查出一个方案解决，删除临时文件

sudo rm -fr ~/.cocoapods/repos/master
pod setup

再次执行 pod install  执行成功了。。。。耗时很长时间 ，尤其是在

Analyzing dependencies   我一度以为又会失败了。

最后出现了

Analyzing dependencies

Downloading dependencies

Installing AFNetworking (2.2.1)

Generating Pods project

Integrating client project

[!] From now on use `testGCD.xcworkspace`.

成功了。