I'm getting error - NotImplementedException: The method or operation is not implemented.

I was using an old Unity Ads 2.0 something, and decided it was about time to update.

After adding Unity Ads through the package manager to 3.4.7, I am receiving this error in my console and have no clue what it is referring too. I don't even know where to start.

I hope someone can steer me in the right direction. Here is what I see in the console:

NotImplementedException: The method or operation is not implemented.
System.Environment.FailFast (System.String message) (at...

I'm getting error - NotImplementedException: The method or operation is not implemented.