Google Mobile Ads GetClientFactory exception

The problem

If you’re experiencing this error when trying to initialize Google Mobile Ads Unity Plugin on an Android device:

It is quite possible that you are facing problems with the linker.

Solution

Open your Assets/link.xml file and add the lines below:

Conclusion

There are probably other causes for this error, but in my case, when using Unity 6000.0.23f1 with Google Mobile Ads Unity Plugin 10.4.2, this was the solution.

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