新PosExplorer()命令抛出空引用异常

我正在尝试用c#打开Posiflex USB现金抽屉。下面是代码(由其他人提供):

using System;
using System.Collections.Generic;
using Microsoft.PointOfService;
namespace MyNamespace
{
  public class CashDrawerClass
  {
    CashDrawer myCashDrawer;
    PosExplorer explorer;
    public CashDrawerClass()
    {
        explorer = new PosExplorer();
        DeviceInfo ObjDevicesInfo = explorer.GetDevice("CashDrawer", "RR-Drawer");
        myCashDrawer = explorer.CreateInstance(ObjDevicesInfo) as CashDrawer;
    }
    public void OpenCashDrawer()
    {
        myCashDrawer.Open();
        myCashDrawer.Claim(1000);
        myCashDrawer.DeviceEnabled = true;
        myCashDrawer.OpenDrawer();
        myCashDrawer.DeviceEnabled = false;
        myCashDrawer.Release();
        myCashDrawer.Close();
    }
  }
}

一旦执行到代码:

explorer = new PosExplorer()，抛出以下异常:

类型为"System"的未处理异常。

mscorlib.dll中发生NullReferenceException。

如果有帮助，下面是堆栈跟踪:

 at Microsoft.PointOfService.Pos4NetTelemetry.IsCeipOptInEnabled()
   at System.Lazy`1.CreateValue()
   at System.Lazy`1.LazyInitValue()
   at Microsoft.PointOfService.Pos4NetTelemetry.get_Enabled()
   at Microsoft.PointOfService.Pos4NetTelemetry.SetCurrentProcessBitness()
   at Microsoft.PointOfService.PosExplorer.Initialize()
   at Microsoft.PointOfService.PosExplorer..ctor()
   at RunningRabbit.CashDrawerClass..ctor() in c:'C# Development'RunningRabbit'RunningRabbit'CashDrawerClass.cs:line 14
   at RunningRabbit.MainPOS.btnOpenDrawer_Click(Object sender, EventArgs e) in c:'C# Development'RunningRabbit'RunningRabbit'MainPOS.cs:line 261
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at DevExpress.XtraEditors.BaseButton.OnMouseUp(MouseEventArgs e)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at DevExpress.Utils.Controls.ControlBase.WndProc(Message& m)
   at DevExpress.XtraEditors.BaseControl.WndProc(Message& msg)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at RunningRabbit.Program.Main() in c:'C# Development'RunningRabbit'RunningRabbit'Program.cs:line 20
   at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
   at System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext, String[] activationCustomData)
   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssemblyDebugInZone()
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()

任何帮助将不胜感激。

RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32).OpenSubKey("SOFTWARE''POSfor.Net''Setup").GetValue("CeipOptIn", (object) 0);