railsのエラーにつきまして

MacでRailsの勉強をしております。
以下のコマンドを入力し、アプリケーションを作成したところエラーがでました。

Errno::EACCES: Permission denied @ dir_s_mkdir -
/Users/S.TANAKA/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/extensions/x86_64-darwin-15/2.3.0-static/bindex-0.5.0
An error occurred while installing bindex (0.5.0), and Bundler
cannot continue.
Make sure that `gem install bindex -v '0.5.0'` succeeds before bundling.
         run  bundle exec spring binstub --all
bundler: command not found: spring
Install missing gem executables with `bundle install`

また、bundle installとコマンドを入力すると以下のエラーが出ます。

SATOSHI-no-MacBook-Air:myapp S.TANAKA$ bundle install
The dependency tzinfo-data (>= 0) will be unused by any of the platforms Bundler is installing for. Bundler is installing for ruby but the dependency is only for x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bundle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`.
Fetching gem metadata from https://rubygems.org/..........
Fetching version metadata from https://rubygems.org/..
Fetching dependency metadata from https://rubygems.org/.
Resolving dependencies...
Using rake 12.0.0
Using concurrent-ruby 1.0.5
Using i18n 0.8.1
Using minitest 5.10.1
Using thread_safe 0.3.6
Using builder 3.2.3
Using erubis 2.7.0
Using mini_portile2 2.1.0
Using rack 2.0.1
Using nio4r 2.0.0
Using websocket-extensions 0.1.2
Using mime-types-data 3.2016.0521
Using arel 7.1.4
Installing bindex 0.5.0 with native extensions
Using bundler 1.14.6
Installing byebug 9.0.6 with native extensions
Using coffee-script-source 1.12.2
Using execjs 2.7.0
Using method_source 0.8.2
Using thor 0.19.4
Installing ffi 1.9.18 with native extensions
Using multi_json 1.12.1
Using rb-fsevent 0.9.8
Installing puma 3.8.2 with native extensions
Using sass 3.4.23
Using tilt 2.0.7
Installing sqlite3 1.3.13 with native extensions
Using turbolinks-source 5.0.0
Using tzinfo 1.2.3
Using nokogiri 1.7.1
Using rack-test 0.6.3
Using sprockets 3.7.1
Using websocket-driver 0.6.5
Using mime-types 3.1
Errno::EACCES: Permission denied @ dir_s_mkdir -
/Users/S.TANAKA/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/extensions/x86_64-darwin-15/2.3.0-static/bindex-0.5.0
An error occurred while installing bindex (0.5.0), and Bundler
cannot continue.
Make sure that `gem install bindex -v '0.5.0'` succeeds before bundling.
SATOSHI-no-MacBook-Air:myapp S.TANAKA$

こちらの原因と解決策を教えていただけると幸いです。

何卒よろしくお願いいたします。