react native 0.61 build failed after installing facebook sdk code example

Example 1: install yarn in react native

npm install -g yarn
yarn global add react-native-cli
react-native init sample

Example 2: react native app crashes without error

in react native node-modules go 
 node modules >>  react -native-admob>> android >>Build.gradle 
instead of follwing line
'com.google.android.gms:play-services-ads:+'

write this line 
'com.google.android.gms:play-services-ads:16.0.0'