error happen when running pos install

[cfdtlee]

» pod install
Updating local specs repositories

CocoaPods 1.0.0.beta.6 is available.
To update use: sudo gem install cocoapods --pre
[!] This is a test version we'd love you to try.

For more information see http://blog.cocoapods.org
and the CHANGELOG for this version http://git.io/BaH8pQ.

Analyzing dependencies

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Command

/Users/eric/.rvm/gems/ruby-2.3.0/bin/pod install

Report

• What did you do?
  I run command pod install
• What did you expect to happen?
  Canvas is supposed to install.
• What happened instead?
  but an error occurs.

Stack

   CocoaPods : 0.39.0
        Ruby : ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin15]
    RubyGems : 2.5.1
        Host : Mac OS X 10.11.2 (15C50)
       Xcode : 7.1.1 (7B1005)
         Git : git version 2.4.9 (Apple Git-60)
Ruby lib dir : /Users/eric/.rvm/rubies/ruby-2.3.0/lib
Repositories : master - https://github.com/CocoaPods/Specs.git @ 92aabb977e468f5c6955406c79c520e91f013e63

Plugins

cocoapods-plugins : 0.4.2
cocoapods-search  : 0.1.0
cocoapods-stats   : 0.6.2
cocoapods-trunk   : 0.6.4
cocoapods-try     : 0.5.1

Podfile

source 'https://github.com/CocoaPods/Specs.git'

platform :ios, '7.0'
pod 'Canvas', '~> 0.1.2'

Error

NoMethodError - undefined method `to_ary' for #<Pod::Specification name="Canvas">
Did you mean?  to_query
/Users/eric/.rvm/gems/ruby-2.3.0/gems/cocoapods-0.39.0/lib/cocoapods/resolver/lazy_specification.rb:14:in `method_missing'
/Users/eric/.rvm/gems/ruby-2.3.0/gems/cocoapods-0.39.0/lib/cocoapods/resolver.rb:64:in `flatten'
/Users/eric/.rvm/gems/ruby-2.3.0/gems/cocoapods-0.39.0/lib/cocoapods/resolver.rb:64:in `block in resolve'
/Users/eric/.rvm/gems/ruby-2.3.0/gems/cocoapods-0.39.0/lib/cocoapods/resolver.rb:63:in `tap'
/Users/eric/.rvm/gems/ruby-2.3.0/gems/cocoapods-0.39.0/lib/cocoapods/resolver.rb:63:in `resolve'
/Users/eric/.rvm/gems/ruby-2.3.0/gems/cocoapods-0.39.0/lib/cocoapods/installer/analyzer.rb:539:in `block in resolve_dependencies'
/Users/eric/.rvm/gems/ruby-2.3.0/gems/cocoapods-0.39.0/lib/cocoapods/user_interface.rb:59:in `section'
/Users/eric/.rvm/gems/ruby-2.3.0/gems/cocoapods-0.39.0/lib/cocoapods/installer/analyzer.rb:537:in `resolve_dependencies'
/Users/eric/.rvm/gems/ruby-2.3.0/gems/cocoapods-0.39.0/lib/cocoapods/installer/analyzer.rb:70:in `analyze'
/Users/eric/.rvm/gems/ruby-2.3.0/gems/cocoapods-0.39.0/lib/cocoapods/installer.rb:213:in `analyze'
/Users/eric/.rvm/gems/ruby-2.3.0/gems/cocoapods-0.39.0/lib/cocoapods/installer.rb:136:in `block in resolve_dependencies'
/Users/eric/.rvm/gems/ruby-2.3.0/gems/cocoapods-0.39.0/lib/cocoapods/user_interface.rb:59:in `section'
/Users/eric/.rvm/gems/ruby-2.3.0/gems/cocoapods-0.39.0/lib/cocoapods/installer.rb:135:in `resolve_dependencies'
/Users/eric/.rvm/gems/ruby-2.3.0/gems/cocoapods-0.39.0/lib/cocoapods/installer.rb:105:in `install!'
/Users/eric/.rvm/gems/ruby-2.3.0/gems/cocoapods-0.39.0/lib/cocoapods/command/project.rb:71:in `run_install_with_update'
/Users/eric/.rvm/gems/ruby-2.3.0/gems/cocoapods-0.39.0/lib/cocoapods/command/project.rb:101:in `run'
/Users/eric/.rvm/gems/ruby-2.3.0/gems/claide-0.9.1/lib/claide/command.rb:312:in `run'
/Users/eric/.rvm/gems/ruby-2.3.0/gems/cocoapods-0.39.0/lib/cocoapods/command.rb:47:in `run'
/Users/eric/.rvm/gems/ruby-2.3.0/gems/cocoapods-0.39.0/bin/pod:44:in `<top (required)>'
/Users/eric/.rvm/gems/ruby-2.3.0/bin/pod:23:in `load'
/Users/eric/.rvm/gems/ruby-2.3.0/bin/pod:23:in `<main>'
/Users/eric/.rvm/gems/ruby-2.3.0/bin/ruby_executable_hooks:15:in `eval'
/Users/eric/.rvm/gems/ruby-2.3.0/bin/ruby_executable_hooks:15:in `<main>'

[wilddylan]

try： sudo gem uninstall cocoapods
sudo gem install cocoapods

[cfdtlee]

Thank you. I tried, but still the same problem.

[wilddylan]

it's noamal when i use.

1. cd the xcode project and do pod init
2. in your main target
   
3. pod install --no-repo-update
   
4. your error, ... the cocoapods command throw an exception when query the canvas, missing the function. but we don't know cocoapods code so if you re install this command and redo it but can'f fix your bug... you should create new issue in cocoapods

[cfdtlee]

Ok, thanks!