无法在MSI中运行Wix自定义操作

以下是相应Wix文件中的位:

<Binary Id="INSTALLERHELPER" SourceFile=".\Lib\InstallerHelper.dll" />
<CustomAction Id="HelperAction" BinaryKey="INSTALLERHELPER" DllEntry="CustomAction1" Execute="immediate" />

下面是我自定义操作的完整类文件:

using Microsoft.Deployment.WindowsInstaller;

namespace InstallerHelper
{
  public class CustomActions
  {
    [CustomAction]
    public static ActionResult CustomAction1(Session session)
    {
      session.Log("Begin CustomAction1");

      return ActionResult.Success;
    }
  }
}

该操作通过在UI中按下按钮来运行(目前):

  <Control Id="Next" Type="PushButton" X="248" Y="243" Width="56" Height="17" Default="yes" Text="!(loc.WixUINext)" >
      <Publish Event="DoAction" Value="HelperAction">1</Publish>
  </Control>

MSI (c) (08:5C) [10:08:36:978]: Connected to service for CA interface.
MSI (c) (08:4C) [10:08:37:030]: Note: 1: 1723 2: SQLHelperAction 3: CustomAction1 4: C:\Users\NATHAN~1.TYL\AppData\Local\Temp\MSI684F.tmp 
Error 1723. There is a problem with this Windows Installer package. A DLL required for this install to complete could not be run. Contact your support personnel or package vendor.  Action SQLHelperAction, entry: CustomAction1, library: C:\Users\NATHAN~1.TYL\AppData\Local\Temp\MSI684F.tmp 
MSI (c) (08:4C) [10:08:38:501]: Product: SessionWorks :: Judge Edition -- Error 1723. There is a problem with this Windows Installer package. A DLL required for this install to complete could not be run. Contact your support personnel or package vendor.  Action SQLHelperAction, entry: CustomAction1, library: C:\Users\NATHAN~1.TYL\AppData\Local\Temp\MSI684F.tmp 

Action ended 10:08:38: SQLHelperAction. Return value 3.
DEBUG: Error 2896:  Executing action SQLHelperAction failed.
The installer has encountered an unexpected error installing this package. This may indicate a problem with this package. The error code is 2896. The arguments are: SQLHelperAction, , 

它给我的两个错误代码或信息都不足以告诉我出了什么问题。或者我只是不明白他们说的是错的。

一开始我认为这可能是因为我使用的是wix3.5,所以为了确保我尝试使用wix3.0,但我得到了相同的错误。

你知道我做错了什么吗?