How to use XFShapeView inside xaml?

Hi, I am using the XFShapeView in my Xamarin.Forms project. I successfully used it in code behind. But getting error when I use it in xaml
(Failed to resolve assembly: 'XFShapeView.Forms.Plugin.Abstractions, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null')
The problem probably is in namespace, but I couldn't find the correct namespace anywhere.

<?xml version="1.0" encoding="UTF-8"?>
<ContentView xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:abs="clr-namespace:XFShapeView.Forms.Plugin.Abstractions;assembly=XFShapeView.Forms.Plugin.Abstractions"
             x:Class="DbXF.Controls.CustomPicker">
    <ContentView.Content>
        <Grid>

            <abs:ShapeView BackgroundColor="Transparent"
                           BorderColor="#9b9b9b"
                           BorderWidth="2" />
        </Grid>
    </ContentView.Content>
</ContentView>