无法将java.lang.String类型的对象转换为类型tiagov.rideabike1.Model.Fretes

I am using FirebaseUi to populate one RecyclerView, but when I start the app nothing show up. I see a lot tutorials and videos but nothing work, maybe is a dumb question but I am new on android, here is all the code I am using:I am using FirebaseUi to populate one RecyclerV