I searched on the Internet and I found that this error is 100% caused by a reference to android specific reference in my PCL.
I tried to search for any Android ref in my PCL project, but there is none of it.
This happens when I try to debug it over my iMac Iphone 8 iOS 11.4 simulator
Is there anything which can tell which line of code and which file causes this error? Because it is really hard to find the error when I have a large amount of codes in my project.
So there is auto-generated reference created by "Xamarin.Google.iOS.Signin"
I suppose this is the problem:
There is no reference at all in my PCL: