Create NuGet Package - Error MSB6006: "ApiIntersect.exe" exited with code 1.

I followed the steps at https://developer.xamarin.com/guides/cross-platform/application_fundamentals/nuget-multiplatform-libraries/platform-specific/ and when I reach the step "Create NuGet Package" I always get the following error:

/Users/djunod2/.nuget/packages/nuget.build.packaging/0.1.157-dev/build/NuGet.Build.Packaging.targets(3,3): Error MSB6006: "ApiIntersect.exe" exited with code 1. (MSB6006) (Library.NuGet)

I tried with a new Solution twice now, both yielding the exact same results.