better_paypal_express

Fetching git://github.com/radar/better_spree_paypal_express.git
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Fetching gem metadata from https://rubygems.org/........
Fetching additional metadata from https://rubygems.org/..
Resolving dependencies...
Bundler could not find compatible versions for gem "spree_core":
  In Gemfile:
    spree_paypal_express (>= 0) ruby depends on
      spree_core (~> 2.0.3) ruby

    spree (>= 0) ruby depends on
      spree_core (2.2.2.beta)