ruby-on-rails - Rspec TypeError: クラス Cipher のスーパークラスが一致しません

Question

rspec を起動しようとするとエラーが発生します:

An error occurred while loading ./spec/factories_spec.rb.
Failure/Error:
  FactoryGirl.factories.map(&:name).each do |factory_name|
    describe "The #{factory_name} factory" do
      it 'is valid' do
        build(factory_name).should be_valid
      end
    end
  end

NameError:
  uninitialized constant FactoryGirl
# ./spec/factories_spec.rb:1:in `<top (required)>'
/usr/lib/x86_64-linux-gnu/ruby/2.4.0/openssl.so: warning: already initialized constant OpenSSL::VERSION
/usr/lib/x86_64-linux-gnu/ruby/2.4.0/openssl.so: warning: already initialized constant OpenSSL::OPENSSL_VERSION
/usr/lib/x86_64-linux-gnu/ruby/2.4.0/openssl.so: warning: already initialized constant OpenSSL::OPENSSL_LIBRARY_VERSION

と

An error occurred while loading ./spec/helpers/date_helper_spec.rb.
Failure/Error: require File.expand_path('../../config/environment', __FILE__)

TypeError:
  superclass mismatch for class Cipher
# /var/lib/gems/2.4.0/gems/activesupport-5.1.4/lib/active_support.rb:24:in `require'

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