Getting "LoadError: cannot load such file -- cap-ec2/capistrano" issue suddenly with Capistrano gem v3.4.1

[ethicalmohit]

Hey,

We are getting below issue while deploying from Jenkins suddenly.

Error:

• cap dev deploy
  WARNING: load:defaults has already been invoked and can no longer be modified.
  Check that you haven't loaded a Capistrano plugin in deploy.rb by mistake.
  Plugins must be loaded in the Capfile to initialize properly.
  (Backtrace restricted to imported tasks)
  cap aborted!
  can't modify frozen #<Class:#Rake::Task:0x000000012a3bd0>

Caused by:
LoadError: cannot load such file -- cap-ec2/capistrano

Gemfile:
gem 'cap-ec2', '~> 1.0'

Any hint?

[ethicalmohit]

This has been fixed by loading cap-ec2/capistrano in Capfile.