When I use RN 0.42 in my old iOS project, I define a pod file as follows:

project 'RN3.xcodeproj'

target 'RN3' do

pod 'React', :path => '../node_modules/react-native', :subspecs => [
'Core',
'RCTImage',
'RCTNetwork',
'RCTText',
'RCTWebSocket',
]

end

When I exec pod install in command line, there is an error message:
[!] Unable to find a specification for Yoga (= 0.42.3.React) depended upon by React/Core.

I check the React.podspec, I think there is something wrong in this file, is anybody meet the same issue?