Xamarin UI test, NUnit version unspported?

When I try to run a test I get the following internal error:

I have the following packages installed:

    <packages>
      <package id="Microsoft.Bcl" version="1.1.10" targetFramework="net45" />
      <package id="Microsoft.Bcl.Async" version="1.0.168" targetFramework="net45" />
      <package id="Microsoft.Bcl.Build" version="1.0.21" targetFramework="net45" />
      <package id="Microsoft.Net.Http" version="2.2.29" targetFramework="net45" />
      <package id="NUnit" version="3.0.0" targetFramework="net45" />
      <package id="Xamarin.UITest" version="1.2.0" targetFramework="net45" />
    </packages>