undefined method `new' for "Rack::RawUpload":String

[mohdsameer]

rails generate rich:install

when i run this line i got error ,

middleware/stack.rb:35:in `build': undefined method `new' for "Rack::RawUpload":String
Did you mean?  next (NoMethodError)

my gem file is

gem 'rails_admin', '~> 1.2'
gem 'rich'
gem 'carrierwave', '~> 1.0'

could you help me out from this.
thanks .

[grimmwerks]

I'm having the same issue updating an old application.

[huanged]

same error. any solution?

[tonioriol]

same here, does anyone managed to solve this?

[Aritzaranburu]

I assume there still is no solution?

[Ali-raza-khan]

getting same error, any solution?

[geraldlopez24]

Same error, any solution to this?