Could not load type 'Mediachase.Commerce.Manager.Marketing.PromotionList'

Hi,

After upgrading to EpiServer Commerce v 13.3.1.0, I am seeing this error when I try to open the promotions in Commerce Manager:

Could not load type 'Mediachase.Commerce.Manager.Marketing.PromotionList'.

Source error:

Line 1:  <%@ Control Language="C#" AutoEventWireup="true" Inherits="Mediachase.Commerce.Manager.Marketing.PromotionList" Codebehind="PromotionList.ascx.cs" %>
Line 2:  <%@ Register Src="~/Apps/Core/Controls/EcfListViewControl.ascx" TagName="EcfListViewControl" TagPrefix="core" %>
Line 3:  <core:EcfListViewControl id="MyListView" runat="server" DataKey="PromotionId" AppId="Marketing" DataKeyField="PromotionId" ViewId="Promotion-List" ShowTopToolbar="true"></core:EcfListViewControl>

Source File: /Apps/Marketing/PromotionList.ascx

Any ideas how to fix this? Thanks in advance!

Bart