xcode로 실행할때 발생하는 오류

`Undefined symbols for architecture x86_64:`

"_RCTJavaScriptDidFailToLoadNotification", referenced from:

+[RNSplashScreen show] in RNSplashScreen.o

"_RCTRegisterModule", referenced from:

+[RNSplashScreen load] in RNSplashScreen.o

ld: symbol(s) not found for architecture x86_64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

require "json"

package = JSON.parse(File.read(File.join(__dir__, "package.json")))

Pod::Spec.new do |s|
  s.name         = "react-native-splash-screen"
  s.version      = package["version"]
  s.summary      = package["description"]
  s.author       = 'crazycodeboy'
  s.homepage     = package["homepage"]
  s.license      = package["license"]
  s.platform     = :ios, "7.0"
  s.source       = { :git => "<https://github.com/crazycodeboy/react-native-splash-screen>", :tag => "v#{s.version}" }
  s.source_files  = "ios/*.{h,m}"
  s.dependency "React-Core" //<- "React" to "React-Core"
end