Avalonia invalidCastException - multibinding

Question

We're trying to built a UI with Avalonia for a project. One of our VM's needs to use MultiBinding, but it throws this message: "System.InvalidCastException: 'Unable to cast object of type 'Avalonia.Data.MultiBinding' to type 'Avalonia.Controls.IControl'.'". How do I come around this message?
<Grid ColumnDefinitions="Auto, Auto">
<StackPanel Grid.Column="0">
<Border Classes="Left">
<ScrollViewer MaxHeight="400">
<ItemsControl Items="{Binding PublicationTypes}" Name="PubType">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid ColumnDefinitions="*,Auto,Auto">
<TextBox Text="{Binding Name}" Grid.Column="0" Name="PubName" />
<MultiBinding>
<Binding ElementName="MainView"/>
<Binding Path="Name"/>
</MultiBinding>
<Button Grid.Column="1" Classes="Options" Command="{Binding ElementName=MainView, Path=DataContext.EditPublicationType}" CommandParameter="{Binding ElementName=MainView, Path=DataContext.PublicationTypes}">
<!-- CommandParameter="{Binding ElementName=MainView}-->
<Image Source="avares://Zenref.Ava/Assets/options.ico" />
</Button>
<Button Grid.Column="2" Classes="Cross" Command="{Binding ElementName=MainView, Path=DataContext.DeletePublicationTypeCommand}" CommandParameter="{Binding Name}">
<Image Source="avares://Zenref.Ava/Assets/cross.ico" />
</Button>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</ScrollViewer>
</Border>
</StackPanel>
<StackPanel Grid.Column="1" Orientation="Horizontal" Spacing="50" Margin="20" VerticalAlignment="Top">
<Border Width="250" Height="300" Padding="10">
<StackPanel Orientation="Vertical" Spacing="3">
<StackPanel Orientation="Horizontal" Spacing="10">
<TextBlock Text="Referencer importeret" Width="125"/>
<TextBlock Text=":"/>
<TextBlock Text="60000"/>
</StackPanel>
<StackPanel Orientation="Horizontal" Spacing="10">
<TextBlock Text="Identificeret" Width="125"/>
<TextBlock Text=":"/>
<TextBlock Text="0"/>
</StackPanel>
<StackPanel Orientation="Horizontal" Spacing="10">
<TextBlock Text="Uidentificeret" Width="125"/>
<TextBlock Text=":"/>
<TextBlock Text="0"/>
</StackPanel>
</StackPanel>
</Border>
</StackPanel>
<Button Name="menuButton" Command="{Binding OpenSearchCriteriaCommand}" CommandParameter="{Binding ElementName=MainView}" VerticalAlignment="Bottom" HorizontalAlignment="Left" Width="100" Margin="10">Menu</Button>
<Button Name="startButton" VerticalAlignment="Bottom" HorizontalAlignment="Right" Width="100" Margin="125,10">Start</Button>
<Button Name="exportButton" VerticalAlignment="Bottom" HorizontalAlignment="Right" Width="100" Margin="10,10">Exporter</Button>
</Grid>
We've tried looking through Avalonia's documentation and through stackoverflow, but we haven't found a similar problem.