BuildApk: An element with the same key already exists in the dictonary

Hi there

Running, I think, on stable X.Android (all three show I'm up to date, which is odd)

Xamarin.Android Version: 4.12.3 (Enterprise Edition) Android SDK: /Users/nic/Library/Developer/Xamarin/android-sdk-mac_x86 Supported Android versions: 2.1 (API level 7) 2.2 (API level 8) 2.3 (API level 10) 3.1 (API level 12) 4.0 (API level 14) 4.0.3 (API level 15) 4.1 (API level 16) 4.2 (API level 17) 4.3 (API level 18) 4.4 (API level 19)

Project builds, but I end up with:

/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets: Error: Error executing task BuildApk: An element with the same key already exists in the dictionary. (EducaAndroid)

Any idea what this is?

I'm pulling in:

Xam.Android.Support.v4 Xam.Android.Support.v7.AppCompat Xamarin.Mobile AndHud

and a few of my own bits which just build against Mono.Android

Ta Nic