ruby, rails gem install error - ERROR: While executing gem ... (Encoding::UndefinedConversionError) -

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i tried last version ruby, when run gem install rails, got error

error:  while executing gem ... (encoding::undefinedconversionerror)     u+041d ibm437 in conversion utf-16le utf-8 ibm437

i using windows 8.

but gem list ---local working.. on install, locale set english.

what kind problem it?

use link: https://bugs.ruby-lang.org/issues/10300

they said need chance enconding @ registry.rb file:

folder: ruby2.1.0\lib\ruby\2.1.0\win32 file: registry.rb line: 70

- locale = encoding.find(encoding.locale_charmap) + locale = encoding::utf_8 + #locale = encoding.find(encoding.locale_charmap)

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