Fixing the Elements.xml file causing a deployment error

Here is the error that I got:
Error occurred in deployment step 'Activate Features': Operation is not valid due to the current state of the object
This occurs when you rename your namespace without also updating the "class" value in the Elements.xml file.

Here are the contents of the Elements.xml file:
<?xml version="1.0" encoding="utf-8"?>
<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
  <Receivers ListTemplateId="108">
    <Receiver>
      <Name>EmailReciever</Name>
      <Type>EmailReceived</Type>
      <Assembly>$SharePoint.Project.AssemblyFullName$</Assembly>
      <Class>MyNameSpace.MyProject.MyClass</Class>
      <SequenceNumber>10000</SequenceNumber>
    </Receiver>
  </Receivers>
</Elements>

Here is the Feature's code:
using System;
using System.Security.Permissions;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Security;
using Microsoft.SharePoint.Utilities;
using Microsoft.SharePoint.Workflow;
namespace MyNameSpace.MyProject
{
 public class MyClass : SPEmailEventReceiver
 {
  public override void EmailReceived(SPList list, SPEmailMessage emailMessage, String receiverData)
  {
   base.EmailReceived(list, emailMessage, receiverData);
  }
 }
}

The error occurs when the "class" value is not exactly "Namespace" dot "ClassName"  I've highlighted the pieces above, that make up the "class" value.  Since 2-part namespaces are common I've used that as an example.