OxyPlot for Xamarin.Forms error (exception while loading assemblies)

Hello,
I added OxyPlot.XamarinForms package to my project but I got this error (I'm on beta channel), any idea ?

C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(2,2): Error: Exception while loading assemblies: System.IO.FileNotFoundException: Could not load assembly 'OxyPlot.XamarinForms, Version=2014.1.546.0, Culture=neutral, PublicKeyToken='. Perhaps it doesn't exist in the Mono for Android profile?
Nom de fichier : 'OxyPlot.XamarinForms.dll'
à Xamarin.Android.Tuner.DirectoryAssemblyResolver.Resolve(AssemblyNameReference reference, ReaderParameters parameters)
à Xamarin.Android.Tasks.ResolveAssemblies.AddAssemblyReferences(ICollection`1 assemblies, AssemblyDefinition assembly, Boolean topLevel)
à Xamarin.Android.Tasks.ResolveAssemblies.Execute() (ShakaRoads.Android)