`cannot load such file -- rexml/document`
Tags: rails, ruby
Published: 2021-04-19 13:39:24

> Time: 2021-03-29 22:04 UTC+8:00

> Author: vonhyou

## Cause

`rexml` gem is a bundled gem since Ruby 3.0.0. So we must add `rexml` to `Gemfile`.

On Ruby 2.6 and 2.7, `rexml` gem is default gem. So default `rexml` is used if `Gemfile` does not include `rexml`. On these versions of ruby, we must add `rexml` to `Gemfile` only if we want to use specific `rexml` version.



## Solution

```ruby
gem 'rexml', '~> 3.2', '>= 3.2.4'
```

Add the code above to `Gemfile`

## Full log

```bash
/Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:34:in `require': cannot load such file -- rexml/document (LoadError)
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/activesupport-6.1.3/lib/active_support/dependencies.rb:332:in `block in require'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/activesupport-6.1.3/lib/active_support/dependencies.rb:299:in `load_dependency'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/activesupport-6.1.3/lib/active_support/dependencies.rb:332:in `require'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/selenium-webdriver-3.142.7/lib/selenium/webdriver/firefox.rb:22:in `<main>'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/activesupport-6.1.3/lib/active_support/dependencies.rb:332:in `block in require'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/activesupport-6.1.3/lib/active_support/dependencies.rb:299:in `load_dependency'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/activesupport-6.1.3/lib/active_support/dependencies.rb:332:in `require'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/webdrivers-4.6.0/lib/webdrivers/geckodriver.rb:72:in `<main>'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/activesupport-6.1.3/lib/active_support/dependencies.rb:332:in `block in require'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/activesupport-6.1.3/lib/active_support/dependencies.rb:299:in `load_dependency'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/activesupport-6.1.3/lib/active_support/dependencies.rb:332:in `require'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/webdrivers-4.6.0/lib/webdrivers.rb:4:in `<main>'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bundler-2.2.14/lib/bundler/runtime.rb:66:in `block (2 levels) in require'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bundler-2.2.14/lib/bundler/runtime.rb:61:in `each'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bundler-2.2.14/lib/bundler/runtime.rb:61:in `block in require'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bundler-2.2.14/lib/bundler/runtime.rb:50:in `each'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bundler-2.2.14/lib/bundler/runtime.rb:50:in `require'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bundler-2.2.14/lib/bundler.rb:173:in `require'
        from /Users/toreality/RubymineProjects/sample_app/config/application.rb:7:in `<top (required)>'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/spring-2.1.1/lib/spring/application.rb:92:in `require'                      
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/spring-2.1.1/lib/spring/application.rb:92:in `preload'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/spring-2.1.1/lib/spring/application.rb:157:in `serve'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/spring-2.1.1/lib/spring/application.rb:145:in `block in run'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/spring-2.1.1/lib/spring/application.rb:139:in `loop'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/spring-2.1.1/lib/spring/application.rb:139:in `run'
        from /Users/toreality/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/spring-2.1.1/lib/spring/application/boot.rb:19:in `<top (required)>'
        from <internal:/Users/toreality/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in `require'
        from <internal:/Users/toreality/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in `require'
        from -e:1:in `<main>'
```