WPF

The type reference cannot find a public type named 'OperatorModel'. Line 14 Position 51.

<Window x:Class="Services.Late2Lien.UI.Views.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
        xmlns:local="Services.Late2Lien.UI"
        xmlns:models="Services.Late2Lien.Models;assembly=Services.Late2Lien.Models"
        Title="Walz Late2Lien" 
        Height="596" 
        Width="786">

    <Window.Resources>

        <HierarchicalDataTemplate DataType="{x:Type models:OperatorModel}"
					     ItemsSource="{Binding Path=Facilities}">
        </HierarchicalDataTemplate>

<Image Height="18" Width="18" Stretch="None" Source="{Binding Path=AddProjectImage}"/>

private BitmapImage _AddProjectImage = null;
public BitmapImage AddProjectImage
{
    get
    {
        return _AddProjectImage;
    }
    set
    {
        if (_AddProjectImage != value)
        {
            _AddProjectImage = value;
            RaisePropertyChanged("AddProjectImage");
        }
    }
}

try
{
    Uri theUri = new Uri("pack://application:,,,/Images/add_project_enabled_16x16.png");
    AddProjectImage = new BitmapImage(theUri);
}
catch (Exception e)
{
}

{"Assembly.GetEntryAssembly() returns null. Set the Application.ResourceAssembly property or use the pack://application:,,,/assemblyname;component/ syntax to specify the assembly to load the resource from."}

<TextBlock Name="Jan_Buff" Text="{Binding Path=AllSum,Mode=OneWay}"></TextBlock>

EmployeeSrv.EmpClient EmployeeSrvc = new  EmployeeSrv.EmpClient();
List<EmployeeSrv.Employee> lstEmployee = new List<EmployeeSrv.Employee>();
lstEmployee = EmployeeSrv.GetEmployeeDetails();
 List<Employee> lstEmpWPF = lstEmployee;  //This errors and here covariance has to be used

public List<EmpSrv.Employee> GetUserList()
{
EmpSrv.Client EmployeeSrvc = new EmpSrv.Client;List<EmpSrv.Employee> lstEmployee = new List<EmpSrv.Employee();
try
{
   lstEmployee = EmpSrv.GetEmployeeDetails();
}
catch (Exception ex)
{  throw ex;}
return  lstEmployee;
}