概要
vagrantアップデート後vagrant box addを実行すると,"`rescue in parse_string': Caught Encoding::CompatibilityError at '[{"content-type":"ap': incompatible encoding regexp match (ASCII-8BIT regexp with UTF-8 string) (JSON::ParserError)"で怒られたので,その時の対処方.
対処法
$ rm ~/.vagrant.d/gems/cache/json-*.gem
$ rm ~/.vagrant.d/gems/gems/json-*
$ rm ~/.vagrant.d/gems/specification/json-*.gemspec