Spree 安装错误：找不到 gem 'spree_skrill (>= 0) ruby​​'

Question

I am new to ROR, Now i am installing Spree , these following step

gem install rails -v 3.1.4
rails new mystore
cd mystore
spree install

After that here showing this error

gemfile  spree
     gemfile  spree_usa_epay
     gemfile  spree_skrill
         run  bundle install from "."
Could not find gem 'spree_skrill (>= 0) ruby' in the gems available on this machine.
Run `bundle install` to install missing gems.
precompiling  assets
Could not find gem 'spree_skrill (>= 0) ruby' in the gems available on this machine.
Run `bundle install` to install missing gems.

Answer 1

gem install spree_skrill

And if, after that, you are getting "Could not find gem 'spree_usa_epay (>= 0) ruby' in the gems available on this machine."

gem install spree_usa_epay

after that, I tried running >> spree install again and it worked

Answer 2

In my case, I got this error can't find gem spree (>= 0.a) with executable spree (Gem::GemNotFoundException)

Then I run this command:

gem install spree -v '>= 0.a'

It worked...