I recently updated to a newer version of Capistrano and but when my colleague tried to use this update on her Windows setup she ran into an error starting up WEBrick
... system_extensions.rb:81: undefined method for 'dllload' for Highline::SystemExceptions::WinAPI:Module (NoMethodError)
Several posts suggested to update to a newer Ruby version which isn't currently an option. It also appears that there will be other issues taking that route anyway. So instead I opted to downgrade highline to version 1.6.12 which was reported in one post to resolve the issue.
To downgrade just update your Gemfile to use the specific version of highline.
# Force to specific version of highline to fix issue on
# Windows OS with highline version 1.6.19
gem 'highline', '1.6.12'
Then use bundle:
bundle update highline
This should get you up and running again.