新しい環境にgemインストールしてたらこんなエラーが。 Parsing documentation for json-1.5.5 unable to convert "\xCF" from ASCII-8BIT to UTF-8 for ext/json/ext/generator/generator.bundle, skipping unable to convert "\xCF" from ASCII-8BIT to UTF-8 for ext/json/ext/generator/generator.o, skipping unable to convert "\xCF" from ASCII-8BIT to UTF-8 for ext/json/ext/json/ext/generator.bundle, skipping unable to convert "\xCF" from