Firebase configuration

I am developing an iOS app and my pod file looks like

platform :ios, '8.0'  
use_frameworks!

target 'MYAPP' do  
    pod 'Google-Mobile-Ads-SDK'  
    pod 'Google/SignIn'  
    pod 'Alamofire', '~> 4.0'  
    pod 'AlamofireImage', '~> 3.1'  
end

target 'MYAPPTests' do  
    pod 'Google-Mobile-Ads-SDK'  
    pod 'Google/SignIn'  
    pod 'Alamofire', '~> 4.0'  
    pod 'AlamofireImage', '~> 3.1'  
end

target 'MYAPPUITests' do  
    pod 'Google-Mobile-Ads-SDK'  
    pod 'Google/SignIn'  
    pod 'Alamofire', '~> 4.0'  
    pod 'AlamofireImage', '~> 3.1'  
end

      

        
        
        
      

    

When I run the application and keep finding the following warning in the console:

[Firebase / Core] [I-COR000003] The default Firebase application has not yet been configured. Add [FIRApp configure] to your application init. More details: ".

So, in my appdelegate, I added FIRApp.configure()

which crashes

'[Firebase / Messaging] [I-IID001000] Firebase is not configured correctly. Sender ID is zero or empty. 2017-06-14 18: 25: 37.044 MYAPP [10520: 128089] *** Application terminated due to uncaught exception 'com.firebase.instanceid', Reason: 'Failed to configure Firebase InstanceID. Google Sender ID must not be null or empty. ''

Is GoogleModbileAdsSDK

it that Firebase configuration requires? What am I missing here?