レイクが異常終了しました - プラットフォームが見つかりません。解決する方法？

Question

私は正確にいつI桁、Railsのアプリケーション上で私のRubyをインストールしよう：私に

sudo rake db:migrate

ターミナルリターン：

** Invoke db:migrate (first_time) 
** Invoke environment (first_time) 
** Execute environment 
rake aborted! 
Unable to find Platform 
/Users/ladmin/Sites/IkarosGest/vendor/plugins/wicked_pdf/lib/wicked_pdf.rb:17 
/Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require' 
/Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require' 
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:156:in `require' 
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:521:in `new_constants_in' 
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:156:in `require' 
/Users/ladmin/Sites/IkarosGest/vendor/plugins/wicked_pdf/init.rb:1:in `evaluate_init_rb' 
/Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/rails/plugin.rb:158:in `evaluate_init_rb' 
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/core_ext/kernel/reporting.rb:11:in `silence_warnings' 
/Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/rails/plugin.rb:154:in `evaluate_init_rb' 
/Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/rails/plugin.rb:48:in `load' 
/Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/rails/plugin/loader.rb:38:in `load_plugins' 
/Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/rails/plugin/loader.rb:37:in `each' 
/Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/rails/plugin/loader.rb:37:in `load_plugins' 
/Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/initializer.rb:369:in `load_plugins' 
/Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/initializer.rb:165:in `process' 
/Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/initializer.rb:113:in `send' 
/Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/initializer.rb:113:in `run' 
/Users/ladmin/Sites/IkarosGest/config/environment.rb:6 
/Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require' 
/Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require' 
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:156:in `require' 
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:521:in `new_constants_in' 
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:156:in `require' 
/Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/tasks/misc.rake:4 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:205:in `call' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:205:in `execute' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:200:in `each' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:200:in `execute' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:158:in `invoke_with_call_chain' 
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:151:in `invoke_with_call_chain' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:176:in `invoke_prerequisites' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:174:in `each' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:174:in `invoke_prerequisites' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:157:in `invoke_with_call_chain' 
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:151:in `invoke_with_call_chain' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:144:in `invoke' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:112:in `invoke_task' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:90:in `top_level' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:90:in `each' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:90:in `top_level' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:84:in `top_level' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:62:in `run' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:59:in `run' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/bin/rake:32 
/usr/bin/rake:19:in `load' 
/usr/bin/rake:19 
Tasks: TOP => db:migrate => environment 

Answer 1

はそれを解決します！私はMac上でだから

if Platform.is_windows? 
    include Win32PdfRenderer 
    elsif Platform.is_linux? 
    include NixPdfRenderer 
    else 
    raise "Unable to find Platform" 
    end 

：問題は、コードのこの部分では「wickedpdf.rb」にあったD

Answer 2

rake db:migrateためsudoを使用しないでください。