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I am adding Google Mobile Ads support to a Xamarin.iOS app. I added the following packages (Essentials was already present and building fine). MobileAds requires the Firebase Core and Xamarin.Build.Download packages.

packages in my project

When I build my project I get a number of linking errors such as 

...Error MT5210: Native linking failed, undefined symbol: _GULIsLoggableLevel. Please verify that all the necessary frameworks have been referenced and native libraries are properly linked in. (MT5210) (iPhoneSkeleton)

Any specific ideas on where to get the package/library/reference to resolve this specific error?

Bill Needels
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    https://github.com/xamarin/GoogleApisForiOSComponents/issues/303 Seems to be an issue with versioning? Do you have the latest version of all the packages? Or try this https://stackoverflow.com/a/57143423/11104068 – Saamer Apr 24 '20 at 22:10
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    @Saamer, your stackoverflow reference was useful. It worked. I performed a Clean All in VS for Mac and then manually deleted everything under the project bin and obj folders. A subsequent build worked and I have been in good shape since. FWIW the github reference was not applicable as this was not a versioning issue; all the versioning prereqs were met as of the original post state. Many thanks! – Bill Needels Apr 25 '20 at 15:30
  • Alright I put it in as an answer below. Let me know if it looks good – Saamer Apr 26 '20 at 13:29

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As @BillNeedels mentioned, he was able to fix this by simply doing a Clean All and then deleting all the bin and obj folders, as was mentioned here and it started working in the subsequent build!

FreakyAli
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Saamer
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