【Ruby on Rails】本番環境でpumaが起動しない

railsアプリが本番環境で起動しないです。

sh
1[user@ip-172-31-38-222 disc_room]$ bundle exec puma -e production -C config/puma.rb 
2bundler: failed to load command: puma (/home/user/.rbenv/versions/2.6.5/bin/puma)
3NameError: uninitialized constant #<Class:#<Puma::DSL:0x00000000014e3760>>::Rails
4  config/puma.rb:39:in `_load_from'
5  /home/user/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/puma-3.12.2/lib/puma/dsl.rb:43:in `instance_eval'
6  /home/user/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/puma-3.12.2/lib/puma/dsl.rb:43:in `_load_from'
7  /home/user/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/puma-3.12.2/lib/puma/configuration.rb:194:in `block in load'
8  /home/user/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/puma-3.12.2/lib/puma/configuration.rb:194:in `each'
9  /home/user/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/puma-3.12.2/lib/puma/configuration.rb:194:in `load'
10  /home/user/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/puma-3.12.2/lib/puma/launcher.rb:61:in `initialize'
11  /home/user/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/puma-3.12.2/lib/puma/cli.rb:71:in `new'
12  /home/user/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/puma-3.12.2/lib/puma/cli.rb:71:in `initialize'
13  /home/user/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/puma-3.12.2/bin/puma:8:in `new'
14  /home/user/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/puma-3.12.2/bin/puma:8:in `<top (required)>'
15  /home/user/.rbenv/versions/2.6.5/bin/puma:23:in `load'
16  /home/user/.rbenv/versions/2.6.5/bin/puma:23:in `<top (required)>'

config/puma.rbは、

ruby
1# Puma can serve each request in a thread from an internal thread pool.
2# The `threads` method setting takes two numbers: a minimum and maximum.
3# Any libraries that use thread pools should be configured to match
4# the maximum value specified for Puma. Default is set to 5 threads for minimum
5# and maximum; this matches the default thread size of Active Record.
6#
7threads_count = ENV.fetch("RAILS_MAX_THREADS") { 5 }
8threads threads_count, threads_count
9
10# Specifies the `port` that Puma will listen on to receive requests; default is 3000.
11#
12port        ENV.fetch("PORT") { 3000 }
13
14# Specifies the `environment` that Puma will run in.
15#
16environment ENV.fetch("RAILS_ENV") { "development" }
17
18# Specifies the `pidfile` that Puma will use.
19pidfile ENV.fetch("PIDFILE") { "tmp/pids/server.pid" }
20
21# Specifies the number of `workers` to boot in clustered mode.
22# Workers are forked webserver processes. If using threads and workers together
23# the concurrency of the application would be max `threads` * `workers`.
24# Workers do not work on JRuby or Windows (both of which do not support
25# processes).
26#
27# workers ENV.fetch("WEB_CONCURRENCY") { 2 }
28
29# Use the `preload_app!` method when specifying a `workers` number.
30# This directive tells Puma to first boot the application and load code
31# before forking the application. This takes advantage of Copy On Write
32# process behavior so workers use less memory.
33#
34# preload_app!
35
36# Allow puma to be restarted by `rails restart` command.
37plugin :tmp_restart
38
39bind "unix://#{Rails.root}/tmp/sockets/puma.sock"