ruby on rails - Installing gem "binding_of_caller" creates error and will not install -

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i've attempted bundle following gem:

gem 'binding_of_caller', '~> 0.7.2'

this results in following error message. i've looked around see how fix can't find helps.

/system/library/frameworks/ruby.framework/versions/2.0/usr/lib/ruby/2.0.0/tmpdir.rb:85:in `mkdir': error: failed build gem native extension. (gem::ext::builderror)      permission denied - ./.gem.20140529-2393-154cu0  gem files remain installed in /library/ruby/gems/2.0.0/gems/binding_of_caller-0.7.2 inspection. results logged /library/ruby/gems/2.0.0/extensions/universal-darwin-13/2.0.0/binding_of_caller-0.7.2/gem_make.out     /system/library/frameworks/ruby.framework/versions/2.0/usr/lib/ruby/2.0.0/tmpdir.rb:85:in `block in mktmpdir'     /system/library/frameworks/ruby.framework/versions/2.0/usr/lib/ruby/2.0.0/tmpdir.rb:142:in `create'     /system/library/frameworks/ruby.framework/versions/2.0/usr/lib/ruby/2.0.0/tmpdir.rb:85:in `mktmpdir'     /library/ruby/site/2.0.0/rubygems/ext/ext_conf_builder.rb:14:in `build'     /library/ruby/site/2.0.0/rubygems/ext/builder.rb:161:in `block (2 levels) in build_extension'     /library/ruby/site/2.0.0/rubygems/ext/builder.rb:160:in `chdir'     /library/ruby/site/2.0.0/rubygems/ext/builder.rb:160:in `block in build_extension'     /library/ruby/site/2.0.0/rubygems/ext/builder.rb:159:in `synchronize'     /library/ruby/site/2.0.0/rubygems/ext/builder.rb:159:in `build_extension'     /library/ruby/site/2.0.0/rubygems/ext/builder.rb:198:in `block in build_extensions'     /library/ruby/site/2.0.0/rubygems/ext/builder.rb:195:in `each'     /library/ruby/site/2.0.0/rubygems/ext/builder.rb:195:in `build_extensions'     /library/ruby/site/2.0.0/rubygems/specification.rb:1436:in `block in build_extensions'     /library/ruby/site/2.0.0/rubygems/user_interaction.rb:45:in `use_ui'     /library/ruby/site/2.0.0/rubygems/specification.rb:1434:in `build_extensions'     /library/ruby/site/2.0.0/rubygems/stub_specification.rb:60:in `build_extensions'     /library/ruby/site/2.0.0/rubygems/basic_specification.rb:56:in `contains_requirable_file?'     /library/ruby/site/2.0.0/rubygems/specification.rb:925:in `block in find_inactive_by_path'     /library/ruby/site/2.0.0/rubygems/specification.rb:924:in `each'     /library/ruby/site/2.0.0/rubygems/specification.rb:924:in `find'     /library/ruby/site/2.0.0/rubygems/specification.rb:924:in `find_inactive_by_path'     /library/ruby/site/2.0.0/rubygems.rb:185:in `try_activate'     /library/ruby/site/2.0.0/rubygems/core_ext/kernel_require.rb:132:in `rescue in require'     /library/ruby/site/2.0.0/rubygems/core_ext/kernel_require.rb:144:in `require'     /library/ruby/gems/2.0.0/gems/bundler-1.6.0.rc2/lib/bundler/vendor/net/http/persistent.rb:12:in `<top (required)>'     /library/ruby/site/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'     /library/ruby/site/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'     /library/ruby/gems/2.0.0/gems/bundler-1.6.0.rc2/lib/bundler/vendored_persistent.rb:3:in `<top (required)>'     /library/ruby/site/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'     /library/ruby/site/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'     /library/ruby/gems/2.0.0/gems/bundler-1.6.0.rc2/lib/bundler/fetcher.rb:1:in `<top (required)>'     /library/ruby/gems/2.0.0/gems/bundler-1.6.0.rc2/lib/bundler/cli/install.rb:68:in `run'     /library/ruby/gems/2.0.0/gems/bundler-1.6.0.rc2/lib/bundler/cli.rb:146:in `install'     /library/ruby/gems/2.0.0/gems/bundler-1.6.0.rc2/lib/bundler/vendor/thor/command.rb:27:in `run'     /library/ruby/gems/2.0.0/gems/bundler-1.6.0.rc2/lib/bundler/vendor/thor/invocation.rb:121:in `invoke_command'     /library/ruby/gems/2.0.0/gems/bundler-1.6.0.rc2/lib/bundler/vendor/thor.rb:363:in `dispatch'     /library/ruby/gems/2.0.0/gems/bundler-1.6.0.rc2/lib/bundler/vendor/thor/base.rb:440:in `start'     /library/ruby/gems/2.0.0/gems/bundler-1.6.0.rc2/lib/bundler/cli.rb:9:in `start'     /library/ruby/gems/2.0.0/gems/bundler-1.6.0.rc2/bin/bundle:20:in `block in <top (required)>'     /library/ruby/gems/2.0.0/gems/bundler-1.6.0.rc2/lib/bundler/friendly_errors.rb:5:in `with_friendly_errors'     /library/ruby/gems/2.0.0/gems/bundler-1.6.0.rc2/bin/bundle:20:in `<top (required)>'     /usr/bin/bundle:23:in `load'     /usr/bin/bundle:23:in `<main>'

i don't know how resolve issue. i've tried bundle update didn't work.

can help?

thanks


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