轉載注意：本文由思想瞭望者首發於博客園，轉載請注明出處。
本文參考了：
- https://forum.uipath.com/t/access-denied-to-launch-an-application-when-running-uipath/220677/2
- https://forum.uipath.com/t/access-denied-1/236092/10
因此解決方案並非本人原創。本人僅作搬運工作。
現象
在UiPath Studio中Debug或者Run任意Workflow時（即使是新建的空的Workflow），無法啟動並立即報錯，提示類似以下消息：
| 20.4.2 拒絕訪問。 RemoteException wrapping System.ComponentModel.Win32Exception: 拒絕訪問。
at System.Diagnostics.ProcessManager.OpenProcess(Int32 processId, Int32 access, Boolean throwIfExited)
at System.Diagnostics.Process.GetProcessHandle(Int32 access, Boolean throwIfExited)
at System.Diagnostics.Process.OpenProcessHandle(Int32 access)
at System.Diagnostics.Process.set_EnableRaisingEvents(Boolean value)
at UiPath.Service.UserHost.AttendedServiceProxy.RegisterClientProcess(Int32 clientPid)
at UiPath.Service.UserHost.StudioOperations.<Prepare>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.Service.Core.Utils.TaskUtils.<WithShortWait>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.Service.UserHost.StudioOperations.<>c__DisplayClass5_0.<<RunJob>b__0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.CoreIpc.CancellationHelper`1.<Invoke>d__3`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.CoreIpc.Server.<InvokeMethod>d__22.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.CoreIpc.Server.<HandleRequest>d__21.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.CoreIpc.Server.<>c__DisplayClass4_2.<<-ctor>b__6>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.CoreIpc.IOHelpers.<WithResult>d__10.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.CoreIpc.IOHelpers.<WithTimeout>d__16`1.MoveNext() |
此時，在計算機管理的事件查看器中，應用程序日志可以看到這樣一條錯誤（如下圖）。
本機同時裝有的其它RPA工具上並未發生此現象。
原因
暫不明確。但可以確定問題出在UiPath本身，而不是系統環境。
解決方案
在任務管理器中，在“詳細信息”頁面，選中“UiPath.Service.UserHost.exe”，然后結束任務。即可正常運行。親測有效。
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