Error when compile a binding jar

My project is make in xamarin forms but the problem is when have to integrated with SDK nativo (android & iOS)(Why is very dificult use a SDK with Xamarin Forms?). I try the project binding jar, i add jar but when compile de binding project, i get error:

Error CS1721: Class 'DetectIDSchemaDB.PushInboxSchema' cannot have multiple base classes: 'Object' and 'BaseColumnsConsts' (CS1721) (EnlaceDetectId)

Error CS0507: 'ArrayWheelAdapter.GetItemTextFormatted(int)': cannot change access modifiers when overriding 'protected' inherited member 'AbstractWheelTextAdapter.GetItemTextFormatted(int)' (CS0507) (EnlaceDetectId)

Error CS0534: 'NumericWheelAdapter' does not implement inherited abstract member 'AbstractWheelTextAdapter.GetItemTextFormatted(int)' (CS0534) (EnlaceDetectId)

Sorry for my english, i speak spanish.

Thanks.