I've install react-native-fetch-blob on react-native version 0.60.5.While I run pod install, the error appears as you can see in the 
Kindly guide me on how to resolve this issue
you can use this instead for the new version of react native 0.60 and up https://github.com/joltup/rn-fetch-blob
change dependency React/Core to React-Core using the following command
grep -rl "s.dependency 'React/Core'" node_modules/ | xargs sed -i '' 's=React/Core=React-Core=g'
or
you can go to node modules at path ./node-module/react-native-fetch-blob/react-native-fetch-blob.podspec and change React/Core to React-Core