Ruby On Rails Devise gem conflict error

Question

C:\Users\Prabal\Desktop\rails-club>rails generate devise member

Bundler could not find compatible versions for gem "railties": In snapshot (Gemfile.lock): railties (= 5.1.0)

In Gemfile: railties (~> 5.1.0) x64-mingw32

devise (~> 4.2.1) x64-mingw32 was resolved to 4.2.1, which depends on
  railties (< 5.1, >= 4.1.0) x64-mingw32

devise (~> 4.2.1) x64-mingw32 was resolved to 4.2.1, which depends on
  responders x64-mingw32 was resolved to 2.3.0, which depends on
    railties (< 5.1, >= 4.2.0) x64-mingw32

Running bundle update will rebuild your snapshot from scratch, using only the gems in your Gemfile, which may resolve the conflict.

I am a newbie in ROR please help me how to move on to next step

Answer 1

It looks like you are trying to use devise v4.2.1 gem with rails v5.1.0 . It is not possible to do so at this moment as devise v4.2.1 has a runtime dependency of railties = <5.1, >=4.1.0 and rails v5.1.0 has a runtime dependency of railties = 5.1.0 . End result is a version conflict which is what you are encountering. I would suggest you to downgrade to rails v5.0.2 in order to be able to use devise on your app. There shouldn't be any version conflicts once you do that.