The element LinearLayout has invalid child element

Question

The element LinearLayout has invalid child element Stripe.StripeView

 

 

Last i am working with Stripe 1.7.7.0 But due to some project changes i have upgrade the Stripe.net new .dll but its cause an error. "The type or namespace name 'Stripe' could not be found (are you missing a using directive or an assembly reference?)" i have also tried with fully qualified path to each class like Stripe.StripeCustomer. I have found by click on any class its reference and definition is correct. Class appear in light blue color which found correct but don't know why its appear with this error. i have download Stripe Source and check the reason but found no issue. Please help me how can i will resolve this issue. i am using Visul Studio 2015