RuntimeError - [Xcodeproj] Unkno

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### Command

```

/Users/qqqq/.rvm/rubies/ruby-2.0.0-p643/bin/pod install

```

### Report

* What did you do?

* What did you expect to happen?

* What happened instead?

### Stack

```

   CocoaPods : 1.2.0

        Ruby : ruby 2.0.0p643 (2015-02-25 revision 49749) [x86_64-darwin14.5.0]

    RubyGems : 2.6.6

        Host : Mac OS X 10.13.4 (17E199)

       Xcode : 9.3 (9E145)

         Git : git version 2.15.1 (Apple Git-101)

Ruby lib dir : /Users/qqqq/.rvm/rubies/ruby-2.0.0-p643/lib

Repositories : master - https://github.com/CocoaPods/Specs.git @ d0a0ba10caedbe7cc887411b987a5d458c8e9209

```

### Plugins

```

cocoapods-deintegrate : 1.0.1

cocoapods-plugins    : 1.0.0

cocoapods-search      : 1.0.0

cocoapods-stats      : 1.0.0

cocoapods-trunk      : 1.1.2

cocoapods-try        : 1.1.0

```

### Podfile

```ruby

platform :ios, '8.0'

use_frameworks!

target 'SilverMeter' do

end

```

### Error

```

RuntimeError - [Xcodeproj] Unknown object version.

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/xcodeproj-1.4.2/lib/xcodeproj/project.rb:217:in `initialize_from_file'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/xcodeproj-1.4.2/lib/xcodeproj/project.rb:102:in `open'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/installer/analyzer.rb:851:in `block (2 levels) in inspect_targets_to_integrate'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/installer/analyzer.rb:850:in `each'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/installer/analyzer.rb:850:in `block in inspect_targets_to_integrate'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/user_interface.rb:64:in `section'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/installer/analyzer.rb:845:in `inspect_targets_to_integrate'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/installer/analyzer.rb:66:in `analyze'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/installer.rb:236:in `analyze'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/installer.rb:150:in `block in resolve_dependencies'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/user_interface.rb:64:in `section'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/installer.rb:149:in `resolve_dependencies'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/installer.rb:110:in `install!'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/command/install.rb:37:in `run'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/claide-1.0.1/lib/claide/command.rb:334:in `run'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/command.rb:52:in `run'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/bin/pod:55:in `'

/Users/qqqq/.rvm/rubies/ruby-2.0.0-p643/bin/pod:23:in `load'

/Users/qqqq/.rvm/rubies/ruby-2.0.0-p643/bin/pod:23:in `'

```

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[!] Oh no, an error occurred.

Search for existing GitHub issues similar to yours:

https://github.com/CocoaPods/CocoaPods/search?q=%5BXcodeproj%5D+Unknown+object+version.&type=Issues

If none exists, create a ticket, with the template displayed above, on:

https://github.com/CocoaPods/CocoaPods/issues/new

Be sure to first read the contributing guide for details on how to properly submit a ticket:

https://github.com/CocoaPods/CocoaPods/blob/master/CONTRIBUTING.md

Don't forget to anonymize any private data!

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[!] The Podfile does not contain any dependencies.

qqqqdeMacBook-Pro:SilverMeter qqqq$ pod search JPush 

Creating search index for spec repo 'master'.. Done!

看到这么一“堆”  真的是无从下手，没遇到过这么长的，有经验的可能会从中找到问题所在，我是根据最初的出现--gem  -- ruby等字眼，判断  可能是ruby/gem的问题  

起初认为是ruby版本过低了，于是升级ruby。升级过程中发现RVM不存在，于是安装RVM

（通过  rvm list known  命令查看已知的 Ruby 版本，提示-bash: $: command not found，说明你的RVM不存在，重新安装下-----

$ \curl -sSL https://get.rvm.io | bash -s stable

$ source ~/.bashrc

$ source ~/.bash_profile 

一步步执行   

 修改 RVM 的 Ruby 安装源到 Ruby China 的 Ruby 镜像服务器，这样能提高安装速度）

$ echo "ruby_url=https://cache.ruby-china.org/pub/ruby" > ~/.rvm/user/db

之后执行：rvm list known    查看ruby的版本 

 # MRI Rubies

[ruby-]1.8.6[-p420]

[ruby-]1.8.7[-head] # security released on head

[ruby-]1.9.1[-p431]

[ruby-]1.9.2[-p330]

[ruby-]1.9.3[-p551]

[ruby-]2.0.0[-p648]

[ruby-]2.1[.10]

[ruby-]2.2[.7]

[ruby-]2.3[.4]

[ruby-]2.4[.1]

ruby-head

这些是ruby的版本  最新2.4

安装最新ruby -------    rvm install 2.4

No checksum for downloaded archive, recording checksum in user configuration.

ruby-2.4.1 - #extracting rubygems-2.6.14....

ruby-2.4.1 - #removing old rubygems.........

ruby-2.4.1 - #installing rubygems-2.6.14...........................

ruby-2.4.1 - #gemset created /Users/qqqq/.rvm/gems/ruby-2.4.1@global

ruby-2.4.1 - #importing gemset /Users/qqqq/.rvm/gemsets/global.gems......|

ruby-2.4.1 - #generating global wrappers........

ruby-2.4.1 - #gemset created /Users/qqqq/.rvm/gems/ruby-2.4.1

ruby-2.4.1 - #importing gemsetfile /Users/qqqq/.rvm/gemsets/default.gems evaluated to empty gem list

ruby-2.4.1 - #generating default wrappers........

ruby-2.4.1 - #adjusting #shebangs for (gem irb erb ri rdoc testrb rake).

Install of ruby-2.4.1 - #complete 

Ruby was built without documentation, to build it run: rvm docs generate-ri     

安装成功  

之后试了下   pod install   还是报错   但是  现在 出来明确问题出在哪了 --- /Users/qqqq/.rvm/rubies/ruby-2.0.0-p643/lib/ruby/site_ruby/2.0.0/rubygems.rb:270:in `find_spec_for_exe': can't find gem cocoapods (>= 0.a) (Gem::GemNotFoundException)  提示我没有找到gem   所以重新安装下gem   ----

sudo gem uninstall cocoapods

gem install cocoapods 

两步执行    最后提示   28 gems installed  安装成功

执行  pod install    成功

（最后  如果  还出现  上述问题   ruby之前没删除 ，存在好几个版本，  执行rvm --default use 2.4.1  语句    让ruby默认换成最新的版本）