Using imported views in xaml

Hello,

I'm trying to create an autocomplete search bar using Forms.Labs' AutoCompleteView. But I'm always getting "Type AutoCompleteView not found in xmlns". The xaml and cs files use the same class name, i um "using" xamarin.forms.labs.controls and i can even create this view in the cs file, but not in xaml. What can i be doing wrong?

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="InfarmedPrototype.Views.MainPage"
             BindingContext = "viewModel"
             Title ="Infomed"
             BackgroundColor="Black">

    using Xamarin.Forms.Labs;
    using Xamarin.Forms.Labs.Controls;
    namespace InfarmedPrototype.Views
    {
        public partial class MainPage : ContentPage
        {
    ....

Thanks in advance.