Construct 3 Plugin Admob Plus PRO

I get this error when exporting to Xcode, do you have a suggestion for me?

Error: Discovered platform "ios@6.1.1" in config.xml or package.json. Adding it to the project

Using cordova-fetch for cordova-ios@6.1.1

Adding ios project...

Creating Cordova project for the iOS platform:

Path: ~~/ios

Package: com.admob.plus

Name: Admob Plus

iOS project created with cordova-ios@6.1.1

Plugin 'cordova-admob-plus' found in config.xml... Migrating it to package.json

Plugin 'cordova-plugin-whitelist' found in config.xml... Migrating it to package.json

Plugin 'cordova-plugin-splashscreen' found in config.xml... Migrating it to package.json

Plugin 'cordova-plugin-statusbar' found in config.xml... Migrating it to package.json

Discovered saved plugin "cordova-admob-plus". Adding it to the project

Installing "cordova-admob-plus" for ios

Running command: pod install --verbose

Failed to install 'cordova-admob-plus': Error: pod: Command failed with exit code 31

at ChildProcess.whenDone (~~/superspawn.js:136:25)

at ChildProcess.emit (events.js:223:5)

at maybeClose (~~/child_process.js:1021:16)

at Process.ChildProcess._handle.onexit (~~/child_process.js:283:5)

Failed to restore plugin "cordova-admob-plus" from config.xml. You might need to try adding it again. Error: Error: pod: Command failed with exit code 31

Discovered saved plugin "cordova-plugin-whitelist". Adding it to the project

Installing "cordova-plugin-whitelist" for ios

Discovered saved plugin "cordova-plugin-splashscreen". Adding it to the project

Installing "cordova-plugin-splashscreen" for iOS 
Discovered saved plugin "cordova-plugin-statusbar".
Adding it to the project Installing "cordova-plugin-statusbar" for ios