Podfile

platform :ios, '10.0'

require_relative '../node_modules/react-native-unimodules/cocoapods.rb'

# don't just copy and paste this, notice that the target names should align with what is already in your Podfile
target 'YourAppNameHere' do
  pod 'React', :path => '../node_modules/react-native', :subspecs => [
    'Core',
    'CxxBridge',
    'DevSupport',
    'RCTText',
    'RCTNetwork',
    'RCTWebSocket',
    'RCTAnimation',
    'RCTImage',
  ]

  pod 'yoga', :path => '../node_modules/react-native/ReactCommon/yoga'
  pod 'DoubleConversion', :podspec => '../node_modules/react-native/third-party-podspecs/DoubleConversion.podspec'
  pod 'glog', :podspec => '../node_modules/react-native/third-party-podspecs/glog.podspec'
  pod 'Folly', :podspec => '../node_modules/react-native/third-party-podspecs/Folly.podspec'

  use_unimodules!
  
  target 'YourAppNameHereTests' do
    inherit! :search_paths
  end
end

I manage to work around this error by downgrading the version of react-native-unimodules to 0.6.0. It seems that there is an issue with version 0.7.0

@apostolou try these versions too, see how high you can go before the error occurs again ^0.7.0-rc.1 ^0.7.0-rc.2 ^0.7.0-rc.3 ^0.7.0-rc.4

Have the same issues as @apostolou. 0.6.0 worked, but starting from 0.7.0-rc.1 have the same error as @nolife08021.