Activeadmin with activeadmin-axlsx gem, getting bin/rails:6: warning: already initialized constant APP_PATH Error

Question

I'm using ActiveAdmin gem for Admin Interface in my Rails4.1 application, I want to download the index page in excel sheet, for that i have used activeadmin-axlsx gem to get download xlsx files. After adding this gem into my Gemfile, running rails s getting the below error in development mode.

bin/rails:6: warning: already initialized constant APP_PATH

i have tried the below code also,

rake rails:update:bin

not able to start the server.

How do i solve this error ?

Answer 1

Added the below gem in Gemfile

gem 'zip-zip'

rails s is working fine.