Rails 5: undefined method `helper' for ActionController::API:Class

[Deekor]

Just upgraded to Rails 5 and am now getting this error when starting my server.

Rails 5: undefined method `helper' for ActionController::API:Class

Stack trace shows it's coming from

filepicker-rails-2.1.0/lib/filepicker_rails/engine.rb:13:in `block (2 levels) in <class:Engine>': undefined method `helper' for ActionController::API:Class (NoMethodError)

[kyuss]

Merged and fixed in version 2.2.0.