Unable to activate Xamarin Unhanded ERROR - Visual Studio 2015 update 2

Question

I try to activate xamarin account on Visual Studo 2015 Update 2 the error is:

System.FormatException: One of the identified items was in an invalid format.
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Answer 1

Take a look at this discussion in the Xamarin forums. There are listed several common issues. Your question's there as well:

Xamarin for All! Stable Release: Xamarin 4, Cycle 6 – Service Release 3

Quoted from there:

Ensure that you have updated all of your installed Xamarin packages on both Windows and Mac to match the versions listed under "Release Info" below.