> rake db:migrate --trace rake aborted! NameError: undefined local variable or method `__dir__' for main:Object F:/OpenServer/domains/localhost/webrails/config/boot.rb:1:in `<top (required)>' F:/OpenServer/domains/localhost/webrails/config/application.rb:1:in `require_relative' F:/OpenServer/domains/localhost/webrails/config/application.rb:1:in `<top (required)>' F:/OpenServer/domains/localhost/webrails/Rakefile:4:in `require_relative' F:/OpenServer/domains/localhost/webrails/Rakefile:4:in `<top (required)>' C:/Ruby19/lib/ruby/gems/1.9.1/gems/rake-12.0.0/lib/rake/rake_module.rb:28:in `load' C:/Ruby19/lib/ruby/gems/1.9.1/gems/rake-12.0.0/lib/rake/rake_module.rb:28:in `load_rakefile' C:/Ruby19/lib/ruby/gems/1.9.1/gems/rake-12.0.0/lib/rake/application.rb:687:in `raw_load_rakefile' C:/Ruby19/lib/ruby/gems/1.9.1/gems/rake-12.0.0/lib/rake/application.rb:96:in `block in load_rakefile' C:/Ruby19/lib/ruby/gems/1.9.1/gems/rake-12.0.0/lib/rake/application.rb:178:in `standard_exception_handling' C:/Ruby19/lib/ruby/gems/1.9.1/gems/rake-12.0.0/lib/rake/application.rb:95:in `load_rakefile' C:/Ruby19/lib/ruby/gems/1.9.1/gems/rake-12.0.0/lib/rake/application.rb:79:in `block in run' C:/Ruby19/lib/ruby/gems/1.9.1/gems/rake-12.0.0/lib/rake/application.rb:178:in `standard_exception_handling' C:/Ruby19/lib/ruby/gems/1.9.1/gems/rake-12.0.0/lib/rake/application.rb:77:in `run' C:/Ruby19/lib/ruby/gems/1.9.1/gems/rake-12.0.0/exe/rake:27:in `<top (required)>' C:/Ruby19/bin/rake:23:in `load' C:/Ruby19/bin/rake:23:in `<main>'

I use openserver and win10

rails -v Rails 5.0.1

gem -v 1.8.24

rake rake aborted!

    1 answer 1

    The __dir__ method, the absence of which he complains, is absent in Ruby 1.9.

    And in general, Rails 5 requires Ruby version 2.2.2 or higher .

    Get updated.