`to_specs': Could not find 'railties' (>= 0) among 8 total gem(s) (Gem::LoadError)-Twitter bootstrap

I postes this question because I didn’t find any related answer on stackoverflow. I did everything. I will explain what I have tried.
When I start the Rails server using rails s, I get the following output:

/Users/nour/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/dependency.rb:298:in `to_specs': Could not find 'railties' (>= 0) among 8 total gem(s) (Gem::LoadError)
    from /Users/nour/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/dependency.rb:309:in `to_spec'
    from /Users/nour/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_gem.rb:53:in `gem'
    from /Users/nour/.rbenv/versions/2.1.2/bin/rails:22:in `<main>'

Output for gem list:

*** LOCAL GEMS ***

jar-dependencies (0.2.6)
jruby-openssl (0.9.19 java)
json (1.8.0 java)
rake (10.1.0)
rdoc (4.1.2)

Output for gem install rails:

ERROR:  Loading command: install (OpenSSL::X509::StoreError)
    setting default path failed: Invalid keystore format
ERROR:  While executing gem ... (NoMethodError)
    undefined method `invoke_with_build_args' for nil:NilClass

Output for bundle install:

/Users/nour/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/dependency.rb:298:in `to_specs': Could not find 'bundler' (>= 0) among 8 total gem(s) (Gem::LoadError)
    from /Users/nour/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/dependency.rb:309:in `to_spec'
    from /Users/nour/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_gem.rb:53:in `gem'
    from /Users/nour/.rbenv/versions/2.1.2/bin/bundle:22:in `<main>'

Output for gem install bundler:

ERROR:  Loading command: install (OpenSSL::X509::StoreError)
    setting default path failed: Invalid keystore format
ERROR:  While executing gem ... (NoMethodError)
    undefined method `invoke_with_build_args' for nil:NilClass

$ gem list

*** LOCAL GEMS ***

aasm (3.4.0)
actionmailer (4.2.6, 4.2.5, 4.2.4, 4.1.10, 4.1.8, 4.1.7, 4.1.6, 4.1.4, 4.1.0, 4.0.2, 3.2.13, 3.2.2, 2.3.18)
actionpack (4.2.6, 4.2.5, 4.2.4, 4.1.10, 4.1.8, 4.1.7, 4.1.6, 4.1.4, 4.1.0, 4.0.2, 3.2.13, 3.2.2, 2.3.18)
actionview (4.2.6, 4.2.5, 4.2.4, 4.1.10, 4.1.8, 4.1.7, 4.1.6, 4.1.4, 4.1.0)
active_model_serializers (0.8.3)
active_shipping (1.6.0, 1.4.3)
active_utils (3.2.0, 3.0.0, 2.2.3)
activejob (4.2.6, 4.2.5, 4.2.4)
activejob_backport (0.0.3)
activemerchant (1.53.0, 1.44.1, 1.43.3)
activemodel (4.2.6, 4.2.5, 4.2.4, 4.1.10, 4.1.8, 4.1.7, 4.1.6, 4.1.4, 4.1.0, 4.0.2, 3.2.13, 3.2.2)
activerecord (4.2.6, 4.2.5, 4.2.4, 4.1.10, 4.1.8, 4.1.7, 4.1.6, 4.1.4, 4.1.0, 4.0.2, 3.2.13, 3.2.2, 2.3.18)
activerecord-deprecated_finders (1.0.3)
activeresource (3.2.13, 3.2.2, 2.3.18)
activesupport (4.2.6, 4.2.5, 4.2.4, 4.1.10, 4.1.8, 4.1.7, 4.1.6, 4.1.4, 4.1.0, 4.0.2, 3.2.13, 3.2.2, 2.3.18)
acts-as-taggable-on (3.5.0)
acts_as_commentable (4.0.2)
acts_as_indexed (0.8.3)
acts_as_list (0.7.6, 0.7.4, 0.7.2, 0.3.0)
acts_as_votable (0.10.0)
addressable (2.5.2, 2.4.0, 2.3.8, 2.3.6)
ahoy_matey (1.4.2, 1.4.0, 1.2.1)
ancestry (2.1.0)
angularjs-rails (1.2.22)
animate-rails (1.0.10, 1.0.9, 1.0.8, 1.0.7)
anjlab-bootstrap-rails (3.0.0.3)
annotate (2.6.5)
arbre (1.0.3, 1.0.2)
arel (6.0.4, 6.0.3, 5.0.1.20140414130214, 4.0.2, 3.0.3)
asset_sync (1.1.0)
auto_html (1.6.4)
autoprefixer-rails (2.2.0.20140804)
awesome_nested_set (3.0.1)
awesome_print (1.8.0, 1.6.1, 1.2.0)
aws-sdk (2.1.30, 1.66.0, 1.27.0)
aws-sdk-core (2.1.30)
aws-sdk-resources (2.1.30)
aws-sdk-v1 (1.66.0)
aws_cf_signer (0.1.3)
axiom-types (0.1.1)
babosa (1.0.2)
bcrypt (3.1.11, 3.1.10, 3.1.9, 3.1.7)
bcrypt-ruby (3.1.5)
best_in_place (3.0.2)
better_errors (2.0.0)
bigdecimal (1.2.4)
binding_of_caller (0.7.3, 0.7.2)
bootstrap-material-design (0.1.1)
bootstrap-sass (3.3.1.0, 3.2.0.2, 3.2.0.1, 2.3.1.3)
bootstrap_form (2.2.0)
bourbon (3.2.4, 3.2.3)
breadcrumbs_on_rails (2.3.1)
browser (2.2.0, 2.1.0, 1.0.1)
bson (2.3.0)
buftok (0.2.0)
builder (3.2.3, 3.2.2, 3.1.4, 3.0.4)
bundler (1.16.0)
byebug (9.0.6, 9.0.5, 8.2.5, 8.2.4, 8.2.2, 8.2.1, 6.0.2, 5.0.0, 3.4.0)
callsite (0.0.11)
camertron-eprun (1.1.0)
cancan (1.6.10)
cancancan (1.9.2, 1.8.4)
canonical-rails (0.0.7)
capybara (2.4.4, 2.4.1)
capybara-screenshot (1.0.3)
caracal (1.0.4)
carmen (1.0.2, 1.0.1)
carrierwave (0.10.0)
celluloid (0.16.0)
CFPropertyList (2.3.1)
chartkick (2.0.0, 1.4.1)
choice (0.2.0, 0.1.6)
chunky_png (1.3.10, 1.3.8, 1.3.4, 1.3.3)
cldr-plurals-runtime-rb (1.0.0)
climate_control (0.0.3)
cloudinary (1.0.76)
cocaine (0.5.8, 0.5.7, 0.5.5, 0.5.4)
cocoon (1.2.6)
codeclimate-test-reporter (0.4.1)
coderay (1.1.0)
coercible (1.0.0)
coffee-rails (4.1.1, 4.1.0, 4.0.1, 3.2.2)
coffee-script (2.4.1, 2.3.0)
coffee-script-source (1.12.2, 1.10.0, 1.9.1.1, 1.9.1, 1.9.0, 1.8.0, 1.7.1)
colorator (0.1)
colored (1.2)
colorize (0.7.3)
columnize (0.9.0, 0.8.9)
commonjs (0.2.7)
compass (0.12.7, 0.12.2)
compass-rails (2.0.0, 1.1.7)
concurrent-ruby (1.0.5, 1.0.2, 1.0.1, 1.0.0)
connection_pool (2.0.0)
countries (1.1.0, 0.9.3)
country_select (2.1.1)
crass (1.0.3, 1.0.2)
css_parser (1.3.5)
css_splitter (0.4.2)
cssminify (1.0.2)
currencies (0.4.2)
daemons (1.2.3, 1.2.2, 1.1.9, 1.0.10)
database_cleaner (1.3.0)
debug_inspector (0.0.3, 0.0.2)
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diff-lcs (1.2.5)
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domain_name (0.5.25, 0.5.24)
dotenv (1.0.2)
dotenv-rails (1.0.2)
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draper (1.4.0)
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email_spec (1.6.0)
enumerable-lazy (0.0.1)
equalizer (0.0.11, 0.0.9)
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eventmachine (1.2.0.1, 1.0.8, 1.0.7, 1.0.3)
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excon (0.45.4, 0.39.5)
execjs (2.7.0, 2.6.0, 2.5.2, 2.4.0, 2.3.0, 2.2.2, 2.2.1)
factory_girl (4.5.0, 4.4.0)
factory_girl_rails (4.5.0, 4.4.1)
faker (1.4.3)
faraday (0.9.2, 0.9.0)
fedex (3.9.1)
ffaker (1.25.0)
ffi (1.9.25, 1.9.18, 1.9.10, 1.9.9, 1.9.8, 1.9.6, 1.9.3)
filters_spam (0.5)
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fog (1.32.0, 1.23.0)
fog-atmos (0.1.0)
fog-aws (0.7.4)
fog-brightbox (0.8.0, 0.5.0)
fog-core (1.32.0, 1.24.0)
fog-ecloud (0.1.1)
fog-google (0.0.7)
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fog-local (0.2.1)
fog-powerdns (0.1.1)
fog-profitbricks (0.0.5)
fog-radosgw (0.0.4)
fog-riakcs (0.1.0)
fog-sakuracloud (1.0.1)
fog-serverlove (0.1.2)
fog-softlayer (0.4.7, 0.3.17)
fog-storm_on_demand (0.1.1)
fog-terremark (0.1.0)
fog-vmfusion (0.1.0)
fog-voxel (0.1.0)
fog-xml (0.1.2)
font-awesome-less (4.2.0)
font-awesome-rails (4.6.3.1, 4.6.3.0, 4.5.0.0, 4.2.0.0)
font-awesome-sass (4.4.0, 4.2.2, 4.2.1)
fontcustom (1.3.8)
formatador (0.2.5)
formtastic (3.1.3, 3.0.0, 2.3.1)
formtastic_i18n (0.4.1, 0.1.1)
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foundation-rails (5.4.5.0)
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friendly_id (5.1.0, 5.0.4)
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globalize (5.0.1)
gmaps4rails (2.1.2)
gon (5.2.3)
google_places (0.24.0)
grape (0.16.2)
groupdate (3.0.1, 3.0.0, 2.5.0)
guard (2.8.2)
guard-rails (0.7.0)
guard-rspec (4.3.1)
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hike (1.2.3)
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hitimes (1.2.3, 1.2.2)
html2haml (2.0.0)
htmlentities (4.3.2)
htmltoword (0.5.1)
http (0.6.2)
http-cookie (1.0.2)
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i18n-spec (0.6.0)
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io-console (0.4.2)
ipaddress (0.8.0)
iso (0.2.1)
jbuilder (2.7.0, 2.6.4, 2.6.3, 2.6.0, 2.5.0, 2.4.1, 2.4.0, 2.3.2, 2.3.1, 2.3.0, 2.2.16, 2.2.12, 2.2.10, 2.2.6, 2.2.5, 2.2.4, 2.2.3, 2.2.2, 2.1.3, 1.5.3)
jekyll (3.1.6)
jekyll-sass-converter (1.4.0)
jekyll-watch (1.4.0)
jmespath (1.1.3)
journey (1.0.4)
jquery-fileupload-rails (0.4.6)
jquery-rails (4.3.1, 4.2.1, 4.1.1, 4.1.0, 3.1.5, 3.1.4, 3.1.3, 3.1.2, 3.1.1)
jquery-ui-rails (6.0.1, 5.0.5, 5.0.3, 5.0.2, 5.0.0, 4.2.1)
json (2.0.1, 1.8.6, 1.8.3, 1.8.2, 1.8.1)
jwt (1.0.0)
kaminari (0.17.0, 0.16.3, 0.16.1, 0.15.1)
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letter_opener (1.6.0, 1.4.1, 1.2.0)
libv8 (3.16.14.15, 3.16.14.13, 3.16.14.3 x86_64-darwin-13)
liquid (3.0.6)
listen (3.0.8, 2.10.1, 2.8.1, 2.7.11)
loofah (2.1.1, 2.1.0.rc2, 2.0.3)
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mail (2.7.0, 2.6.6, 2.6.4, 2.6.3, 2.6.1, 2.5.4, 2.4.4)
maildir (2.2.1)
memoizable (0.4.2)
mercenary (0.3.6)
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method_source (0.8.2)
mime-types (3.1, 3.0, 2.99.1, 2.99, 2.6.2, 2.6.1, 2.5, 2.4.3, 2.3, 1.25.1)
mime-types-data (3.2016.0521, 3.2016.0221)
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mini_magick (4.3.6, 3.8.1)
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minitest-rails (2.2.1)
mocha (1.1.0)
modernizr-rails (2.7.1)
monetize (0.4.1)
money (6.2.1)
mongrel (1.2.0.pre2)
moped (2.0.0)
multi_json (1.13.1, 1.12.2, 1.12.1, 1.11.3, 1.11.2, 1.11.1, 1.11.0, 1.10.1)
multi_xml (0.5.5)
multipart-post (2.0.0)
mustermann19 (0.4.4)
mysql2 (0.4.4)
naught (1.0.0)
neat (1.5.1)
negative_captcha (0.4)
nested_form (0.3.2)
net-http-persistent (2.9.4)
net-scp (1.2.1)
net-ssh (2.9.4, 2.9.2, 2.9.1)
netrc (0.10.3, 0.10.2, 0.9.0, 0.8.0, 0.7.7)
nokogiri (1.8.2, 1.8.1, 1.7.1, 1.6.8.1, 1.6.8, 1.6.7.2, 1.6.7.1, 1.6.7, 1.6.6.2, 1.6.4.1, 1.6.3.1)
oauth (0.4.7)
oauth2 (1.0.0)
offsite_payments (2.0.1)
omniauth (1.2.2)
omniauth-facebook (2.0.0)
omniauth-github (1.1.2)
omniauth-linkedin (0.2.0)
omniauth-oauth (1.0.1)
omniauth-oauth2 (1.2.0)
omniauth-twitter (1.0.1)
optionable (0.2.0)
origin (2.1.1)
orm_adapter (0.5.0)
pandoc-ruby (2.0.0)
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paranoia (2.0.2)
paypal-recurring (1.1.0)
pdf-core (0.6.1, 0.2.5)
pg (1.0.0, 0.21.0, 0.20.0, 0.19.0, 0.18.4, 0.18.3, 0.18.2, 0.18.1, 0.17.1, 0.15.1, 0.15.0)
pkg-config (1.1.7)
polyamorous (1.2.0, 1.1.0, 1.0.0)
polyglot (0.3.5)
pony (1.11)
prawn (2.1.0, 1.2.1)
prawn-table (0.1.2)
premailer (1.8.2)
premailer-rails (1.8.0)
pry (0.10.3, 0.10.1)
pry-rails (0.3.4, 0.3.2)
psych (2.0.5)
public_suffix (3.0.2)
quantified (1.0.1)
quiet_assets (1.0.3)
rabl (0.9.4.pre1)
rack (1.6.8, 1.6.5, 1.6.4, 1.5.5, 1.5.4, 1.5.3, 1.5.2, 1.4.5, 1.1.6)
rack-accept (0.4.5)
rack-attack (4.4.1)
rack-cache (1.2)
rack-contrib (1.2.0)
rack-cors (0.2.9)
rack-pjax (1.0.0, 0.8.0)
rack-protection (1.5.3)
rack-ssl (1.3.4)
rack-test (0.6.3, 0.6.2)
radriar (0.1.0.alpha.3)
rails (4.2.6, 4.2.5, 4.2.4, 4.1.10, 4.1.8, 4.1.7, 4.1.6, 4.1.4, 4.1.0, 3.2.13, 3.2.2)
rails-deprecated_sanitizer (1.0.3)
rails-dom-testing (1.0.9, 1.0.8, 1.0.7)
rails-erd (1.4.4, 1.1.0)
rails-html-sanitizer (1.0.3, 1.0.2)
rails-i18n (4.0.3)
rails-simple-search (0.9.8)
rails_12factor (0.0.3, 0.0.2)
rails_serve_static_assets (0.0.5, 0.0.4, 0.0.2)
rails_stdout_logging (0.0.5, 0.0.4, 0.0.3)
railties (4.2.6, 4.2.5, 4.2.4, 4.1.10, 4.1.8, 4.1.7, 4.1.6, 4.1.4, 4.1.0, 4.0.2, 3.2.13, 3.2.2)
rake (12.3.1, 12.3.0, 12.1.0, 12.0.0, 11.3.0, 11.2.2, 11.1.2, 11.1.1, 10.5.0, 10.4.2, 10.4.0, 10.3.2, 10.1.0)
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rb-fsevent (0.10.2, 0.9.7, 0.9.4)
rb-inotify (0.9.10, 0.9.7, 0.9.5)
rb-readline (0.5.1)
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rdoc (4.3.0, 4.2.2, 4.2.1, 4.2.0, 4.1.2, 4.1.1, 4.1.0, 3.12.2)
recaptcha (4.8.0, 3.3.0, 3.0.0, 1.0.2, 0.4.0)
redcarpet (3.3.4, 3.3.3, 3.1.2)
ref (2.0.0, 1.0.5)
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refinerycms-core (3.0.0)
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refinerycms-images (3.0.0)
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sass (3.5.5, 3.5.3, 3.5.2, 3.4.23, 3.4.22, 3.4.21, 3.4.20, 3.4.9, 3.2.19, 3.2.0)
sass-listen (4.0.0)
sass-rails (5.0.7, 5.0.6, 5.0.4, 4.0.5, 4.0.4, 4.0.3, 3.2.6)
sdoc (0.4.2, 0.4.1)
select2-rails (3.5.9.1)
seo_meta (2.0.0.rc.1)
sequel (3.20.0)
sexp_processor (4.6.0)
simple_form (3.0.2)
simple_oauth (0.2.0)
simplecov (0.9.1, 0.9.0)
simplecov-html (0.8.0)
sinatra (1.4.5, 1.0)
sitemap_generator (5.1.0)
slim (2.1.0, 2.0.3)
slim-rails (2.1.5)
slop (3.6.0)
snooby (0.1.5)
sort_alphabetical (1.0.1)
speakingurl-rails (1.1.5)
spina (0.7.0)
spina-template (0.3.0)
spoon (0.0.6, 0.0.4)
spree (2.4.1)
spree_api (2.4.1)
spree_backend (2.4.1)
spree_cmd (2.4.1)
spree_core (2.4.1, 2.3.2)
spree_frontend (2.4.1)
spree_sample (2.4.1)
spring (2.0.2, 2.0.1, 2.0.0, 1.7.2, 1.7.1, 1.6.4, 1.6.3, 1.6.2, 1.6.1, 1.6.0, 1.4.0, 1.3.6, 1.3.3, 1.3.1, 1.2.0, 1.1.3)
sprockets (3.7.1, 3.7.0, 3.6.0, 3.5.2, 2.12.4, 2.12.3, 2.12.1, 2.11.3, 2.11.0, 2.2.3, 2.1.4)
sprockets-rails (3.2.1, 3.2.0, 3.0.4, 3.0.3, 3.0.2, 3.0.1, 3.0.0, 2.3.3, 2.3.2, 2.3.1, 2.2.4, 2.2.2, 2.2.1, 2.2.0, 2.1.4, 2.1.3)
sprockets_better_errors (0.0.4)
sqlite3 (1.3.13, 1.3.12, 1.3.11, 1.3.10, 1.3.9, 1.3.7, 1.3.6, 1.3.5)
state_machine (1.2.0)
stringex (1.5.1)
stripe (1.30.2, 1.15.0)
subexec (0.2.3)
sweet-alert (0.0.5)
sweet-alert-confirm (0.0.3)
taps (0.3.24)
temple (0.6.10, 0.6.9, 0.6.8)
term-ansicolor (1.3.0)
terminal-table (1.4.5)
test-unit (2.1.2.0)
therubyracer (0.12.2, 0.12.1)
thin (1.7.0, 1.6.4, 1.6.3, 1.6.2)
thor (0.20.0, 0.19.4, 0.19.1, 0.14.6)
thread (0.1.4)
thread_safe (0.3.6, 0.3.5, 0.3.4)
tilt (2.0.8, 2.0.7, 2.0.5, 2.0.2, 1.4.1)
timers (4.0.4, 4.0.1)
tins (1.3.3)
treetop (1.4.15)
truncate_html (0.9.2)
ttfunk (1.4.0, 1.2.2)
turbo-sprockets-rails3 (0.2.9)
turbolinks (5.1.1, 5.1.0, 5.0.1, 2.5.3, 2.5.2, 2.5.1, 2.4.0, 2.3.0, 2.2.2)
turbolinks-source (5.1.0, 5.0.3, 5.0.0)
twitter (5.11.0)
twitter-bootstrap-rails (2.2.8)
twitter_cldr (3.1.0)
twocheckout (0.3.1)
tzinfo (1.2.5, 1.2.4, 1.2.3, 1.2.2, 0.3.42, 0.3.41)
uber (0.0.15)
uglifier (4.1.11, 4.1.5, 3.2.0, 3.0.3, 3.0.2, 3.0.0, 2.7.2, 2.7.1, 2.7.0, 2.5.3)
underscore-rails (1.7.0)
unf (0.1.4)
unf_ext (0.0.7.1)
unicode_utils (1.4.0)
user_agent_parser (2.3.0)
uuidtools (2.1.5)
valid_email (0.0.10)
validates_zipcode (0.0.8)
versioncake (2.3.1)
virtus (1.0.5, 1.0.3)
w3c_validators (1.2)
warden (1.2.7, 1.2.6, 1.2.5, 1.2.4, 1.2.3)
web-console (2.3.0, 2.2.1)
will_paginate (3.0.7)
will_paginate-bootstrap (1.0.1)
xpath (2.0.0)
zilch-authorisation (0.0.1)
zurb-foundation (4.3.2)

ruby -v

ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-darwin13.0]

$ rbenv set global 2.1.2

rbenv: no such command `set'

What do you think could be the problem? Please help! Thanks