Sins I upgraded a Website to Version 4.10.0 I get the error:

"The project currently contains references to more than one version of interfaces, a direct reference to version 1.0.4695.30695 and an indirect reference (through 'umbraco.MacroEngines.DynamicNode.GetProperty') to version 1.0.4695.30701"

In a class file in the App_Code folder I try to use the DynamicNodeList - but even within visual studio I see these error. 

I had the same problem last time I upgraded from version 4.7.1.1 to version 4.8. See: http://our.umbraco.org/forum/getting-started/installing-umbraco/33769-Upgrade-from-4711-to-48-Reference-to-more-than-one-version-of-interfaces

This is my code:

Imports System.Xml
Imports DigibizTree
Imports TheFarm.Umbraco.EmbeddedContent
Imports uComponents.DataTypes.UrlPicker.Dto
Imports umbraco.cms.businesslogic.media
Imports Umbraco.MacroEngines
Imports umbraco.NodeFactory
Public Class BannerZone
    Public Property ZoneID As String
    Public Property Zone As Node
    Public Property PositionCount As Integer
    Public Property Size As PositionSize
    Sub New(ByVal _ZoneID As String)
           ...
    End Sub
    Public Function GetPositions() As List(Of Position)
        Dim positions As New List(Of Position)
        If IsNothing(Zone) Then Return positions        
        Dim BookedBanners As New DynamicNodeList(GetDisplayedBannerNodes())
        Dim _banner As Banner
        For i As Integer = 0 To PositionCount - 1
            Dim position As New Position            
            position.Size = Me.Size            
            If i <= BookedBanners.Items.Count - 1 Then
                _banner = New Banner(BookedBanners(i), position.Size, Zone)
                position.Banner = _banner
            Else
                _banner = New Banner(New DynamicNode(), position.Size, Zone)                
                position.Banner = _banner
            End If
            positions.Add(position)
        Next
        Return positions
    End Function

Does anybody have an idea what the problem is?