System.ArgumentException was unhandled
  HResult=-2147024809
  Message=Attempt to add existing item into a set.
  Source=OpcLabs.BaseLib
  StackTrace:
       at OpcLabs.BaseLib.Collections.Generic.Extensions.ISetExtension.AddNew[T](ISet`1 set, T item)
       at OpcLabs.EasyOpc.UA.Toolkit.UAEngineBase.ConnectSdk()
       at OpcLabs.EasyOpc.UA.Toolkit.UAClientEngineBase.InternalConnect()
       at OpcLabs.EasyOpc.UA.Toolkit.UAClientEngineBase.Connect()
       at OpcLabs.EasyOpc.UA.Implementations.NetSdk.EasyUAEngine.ReadAttributes(UAReadArguments[] readArgumentsArray, EasyUAAdaptableParameters adaptableParameters)
       at OpcLabs.EasyOpc.UA.Implementations.NetSdk.NetSdkEasyUAClient.<>c__DisplayClass33_0.<ReadMultiple>b__0()
       at OpcLabs.EasyOpc.UA.Implementations.NetSdk.NetSdkEasyUAClient.DisposeGuard[TResult](Func`1 func)
       at OpcLabs.EasyOpc.UA.Implementations.NetSdk.NetSdkEasyUAClient.ReadMultiple(UAReadArguments[] readArgumentsArray)
       at OpcLabs.EasyOpc.UA.Internal.ForwardingEasyUAClient.ReadMultiple(UAReadArguments[] readArgumentsArray)
       at OpcLabs.EasyOpc.UA.Internal.DataConvertingEasyUAClient.ReadMultiple(UAReadArguments[] readArgumentsArray)
       at OpcLabs.EasyOpc.UA.Internal.LicensingEasyUAClient.ReadMultiple(UAReadArguments[] readArgumentsArray)
       at OpcLabs.EasyOpc.UA.EasyUAClient.ReadMultiple(UAReadArguments[] readArgumentsArray)
       at yyyTestClient.Form1.button1_Click(Object sender, EventArgs e) in C:\Users\mholbach\dropbox\repos\mfh_swtb_xxxyyyTestClient\yyyTestClient\Form1.cs:line 124
       at System.Windows.Forms.Control.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
       at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ButtonBase.WndProc(Message& m)
       at System.Windows.Forms.Button.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       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 System.Windows.Forms.Application.Run(Form mainForm)
       at yyyTestClient.Program.Main() in C:\Users\mholbach\dropbox\repos\mfh_swtb_xxxyyyTestClient\yyyTestClient\Program.cs:line 19
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       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()
  InnerException: