StartApp SDK binding in android with xamarin

Question

i'm working on an android app with xamarin, and i wanted to add a banner with StartApp SDK (v 3.6.1).

After i created a binding library, and import startapp.jar, when i build it, i've got this error:

Error CS0234 The type or namespace name 'StartAppAd' does not exist in the 
namespace 'Com.Startapp.Android.Publish.AdsCommon' (are you missing an 
assembly reference?) StartApp C:\Users\samih pc\Documents\Visual Studio 
2015\Projects\Random Number\StartApp\obj\Debug\generated\src\Com.Startapp.Android.Publish.Cache.ACMConfig.cs 107 Active

how can i fix that? I don't know which assembly i missing.

Thanks a lot.

Regards, Sam.