Sinatra: `require': cannot load such file -- sinatra (LoadError)

Created on 6 Mar 2016  路  15Comments  路  Source: sinatra/sinatra

I get this error when I try to run a ruby file that contains a minimal ruby code - 

require 'sinatra'

get '/' do
  "Hello, World!"
end

Error - 

/usr/local/Cellar/ruby/2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- sinatra (LoadError)
    from /usr/local/Cellar/ruby/2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from basics.rb:1:in `<main>'

I installed sinatra but I don't know why I get this error.

$ ruby -v
ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin15]
picture iCHAIT

Most helpful comment

I solved this problem.
"gem install sinatra-contrib"

picture kos31de on 11 Mar 2018
👍14 👎2 🚀1

All 15 comments

Possibly related: https://github.com/sinatra/sinatra/issues/227, https://github.com/mperham/sidekiq/issues/814.

dufferzafar picture dufferzafar on 6 Mar 2016

Looked at both of them before opening this issue, they didn't prove to be helpful :(

iCHAIT picture iCHAIT on 6 Mar 2016

@iCHAIT

  1. Can you post the output of gem env here?
  2. Can you check the output of gem list under ruby 2.3.0? Does it include sinatra gem?
  3. Can you see if adding require 'rubygems' before require 'sinatra' also shows this error?
kgrz picture kgrz on 6 Mar 2016
🎉2

@kgrz Thanks for responding, here's the info - 

$ gem env

RubyGems Environment:
  - RUBYGEMS VERSION: 2.4.5
  - RUBY VERSION: 2.2.0 (2015-01-20 patchlevel 0) [java]
  - INSTALLATION DIRECTORY: /Users/chaitanyagupta/bin/jruby/lib/ruby/gems/shared
  - RUBY EXECUTABLE: /Users/chaitanyagupta/bin/jruby/bin/jruby
  - EXECUTABLE DIRECTORY: /Users/chaitanyagupta/bin/jruby/bin
  - SPEC CACHE DIRECTORY: /Users/chaitanyagupta/.gem/specs
  - SYSTEM CONFIGURATION DIRECTORY: /Users/chaitanyagupta/bin/jruby/etc
  - RUBYGEMS PLATFORMS:
    - ruby
    - universal-java-1.7
  - GEM PATHS:
     - /Users/chaitanyagupta/bin/jruby/lib/ruby/gems/shared
     - /Users/chaitanyagupta/.gem/jruby/2.2
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :backtrace => false
     - :bulk_threshold => 1000
     - "install" => "--no-rdoc --no-ri --env-shebang"
     - "update" => "--no-rdoc --no-ri --env-shebang"
  - REMOTE SOURCES:
     - https://rubygems.org/
  - SHELL PATH:
     - /Users/chaitanyagupta/.local/bin
     - /Library/Frameworks/Python.framework/Versions/2.7/bin
     - /Users/chaitanyagupta/bin/jruby/bin
     - /Users/chaitanyagupta/bin/Sencha/Cmd/5.1.2.52
     - /usr/local/bin
     - /usr/bin
     - /bin
     - /usr/sbin
     - /sbin
     - /opt/X11/bin
     - /Users/chaitanyagupta/Code/go/bin

$ gem list

*** LOCAL GEMS ***

activesupport (4.2.5.2)
addressable (2.3.8)
axiom-types (0.1.1)
backports (3.6.8)
bcrypt (3.1.11 java)
bcrypt-ruby (3.1.5 java)
buftok (0.2.0)
builder (3.2.2)
bundler (1.11.2)
coercible (1.0.0)
coffee-script (2.2.0)
coffee-script-source (1.10.0)
daemons (1.2.3)
data_objects (0.10.17)
datamapper (1.2.0)
descendants_tracker (0.0.4)
dm-aggregates (1.2.0)
dm-constraints (1.2.0)
dm-core (1.2.1)
dm-do-adapter (1.2.0)
dm-migrations (1.2.0)
dm-serializer (1.2.2)
dm-sqlite-adapter (1.2.0)
dm-timestamps (1.2.0)
dm-transactions (1.2.0)
dm-types (1.2.2)
dm-validations (1.2.0)
do_jdbc (0.10.17 java)
do_sqlite3 (0.10.17 java)
domain_name (0.5.20160216)
equalizer (0.0.10, 0.0.9)
eventmachine (1.0.9.1 java)
execjs (2.0.2)
fakes3 (0.2.4)
faraday (0.9.2)
fastercsv (1.5.5)
gruff (0.6.0 java)
hike (1.2.3)
http-form_data (1.0.1)
http_parser.rb (0.6.0 java)
i18n (0.7.0)
ice_nine (0.11.1)
jar-dependencies (0.1.2)
jdbc-sqlite3 (3.8.11.2)
jenkins_api_client (1.4.2)
jruby-openssl (0.9.6 java)
json (1.8.3 java, 1.8.0 java)
json_pure (1.8.3)
lolcat (42.1.43)
maven-tools (1.0.7)
memoizable (0.4.2)
minitest (5.8.4, 5.4.1)
mixlib-shellout (2.2.6)
multi_json (1.11.2)
multipart-post (2.0.0)
naught (1.1.0)
nokogiri (1.6.7.2 java)
paint (1.0.1)
power_assert (0.1.4)
rack (1.5.5)
rack-protection (1.5.3)
rack-test (0.6.3)
rake (10.1.0)
rdoc (4.1.0)
rmagick4j (0.3.9 java)
ruby-maven (3.1.1.0.8)
ruby-maven-libs (3.1.1)
rufus-scheduler (2.0.24)
sass (3.4.14, 3.2.19)
shotgun (0.9.1)
simple_oauth (0.3.1)
sinatra (1.4.7)
sprockets (2.10.2)
stringex (1.5.1)
tabula-extractor (0.7.6 java)
terminal-table (1.5.2)
test-unit (3.0.3)
thor (0.18.1)
thread_safe (0.3.5 java, 0.3.4 java)
tilt (1.4.1)
trollop (2.1.2)
tzinfo (1.2.2)
unf (0.1.4 java)
uuidtools (2.1.5)
virtus (1.0.4)

Can you see if adding require 'rubygems' before require 'sinatra' also shows this error?

I tried this, still getting the same error :(

iCHAIT picture iCHAIT on 6 Mar 2016

There seems to be a slight mismatch between the ruby versions from your first post and the gem env output. Notice that the gem env output points to a jruby 2.2.0 executable whereas in your first post, the ruby version is MRI 2.3.0.

kgrz picture kgrz on 7 Mar 2016

@kgrz Okay, how can I fix it?

iCHAIT picture iCHAIT on 7 Mar 2016

Do you use any ruby version managers? If not, RVM, chruby, rbenv are the most common ones and these will abstract away all these quirks related to setting up correct gem paths and executable paths. Each of those managers also provide ways to install new rubies and keep them updated.

kgrz picture kgrz on 7 Mar 2016

Thanks.

iCHAIT picture iCHAIT on 9 Mar 2016

@iCHAIT
Were you able to resolve the issue? I am facing similar issue.
@kgrz I use rbenv version manager, Ruby 2.4.0 and sinatra gem installed.
I am getting below error:
/home/pravin/.rbenv/versions/2.3.1/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in require': cannot load such file -- sinatra/reloader (LoadError) from /home/pravin/.rbenv/versions/2.3.1/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:inrequire'
from server.rb:3:in `

'

pravinpande picture pravinpande on 28 May 2017

@pravinpande Yeah, I was able to resolve it. So apparently there were 2 versions of ruby installed on my machine, deleted both of them, and did a fresh install of the required version using rvm.

Would recommend using any ruby version manager as pointed out by @kgrz

iCHAIT picture iCHAIT on 28 May 2017

Looks like there is something else. I have only one version but it's giving me the same error.

pravinpande picture pravinpande on 28 May 2017

So apparently sinatra-reloader gem was missing. Thanks @iCHAIT

pravinpande picture pravinpande on 28 May 2017
👍7

ruby app.rb
/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in require': cannot load such file -- active_record (LoadError) from /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:inrequire'
from app.rb:3:in `

'

sravanthbaratam picture sravanthbaratam on 1 Aug 2017

I solved this problem.
"gem install sinatra-contrib"

kos31de picture kos31de on 11 Mar 2018
👍14 👎2 🚀1

I solved but installing sinatra and sinatra-contrib on their own. abandoned bundle install

chrisdel101 picture chrisdel101 on 15 Nov 2018
Was this page helpful?
0 / 5 - 0 ratings

Related issues

paulmenzel picture paulmenzel  路  4Comments
aren55555 picture aren55555  路  7Comments
GCorbel picture GCorbel  路  7Comments
namusyaka picture namusyaka  路  5Comments
salmagomaa picture salmagomaa  路  3Comments