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LoadTemplate is null causing build error

I am getting the error mentioned above when I try to implement a data template selector on the sfRotator control. 


Running on Visual Studio Enterprise 2019
Syncfusion control version 17.1.0.47

        <ResourceDictionary>

            <DataTemplate x:Key="SampleTemplateTextLine">
                <ViewCell>
                    <local:TextLine
                        HorizontalOptions="FillAndExpand"
                        Columns="{Binding Columns}" />
                </ViewCell>
            </DataTemplate>

            <DataTemplate x:Key="SampleTemplateEmptyLine">
                <ViewCell>
                    <BoxView
                        BackgroundColor="Transparent"
                        HorizontalOptions="FillAndExpand"
                        HeightRequest="10"/>
                </ViewCell>
            </DataTemplate>

            <local:SampleTemplateSelector x:Key="SampleTemplateSelector"
                SampleTemplateTextLine="{StaticResource SampleTemplateTextLine}"
                SampleTemplateEmptyLine="{StaticResource SampleTemplateEmptyLine}" />
        </ResourceDictionary>

            <sfRotator:SfRotator
                HorizontalOptions="FillAndExpand"
                VerticalOptions="FillAndExpand"
                NavigationStripMode="Dots"
                NavigationDirection="Horizontal"
                ItemsSource="{Binding SampleList}"
                ItemTemplate="{StaticResource SampleTemplateSelector}">
            </sfRotator:SfRotator>