We just installed Courier 2.1.1 but receive the following exception from the Courier.asmx (which inturn gets a 404 in the backend when deploying)

Umbraco.Courier.UI.Application.StatusItem cannot be serialized because it does not have a parameterless constructor. 

Using Redgate's .NET Reflector we found this:

public class StatusItem
{
    // Fields
    public DateTime DateTime;
    public string Id;
    public ItemIdentifier ItemId;
    public string Message;

    // Methods
    public StatusItem(string id, string message)
    {
        this.Id = id;
        this.Message = message;
    }
}

So the constructor is missing...

Can you please provide a fix for this?

Regards