Sharepoint Workflow 中 "COMException (0x80004005): Cannot complete this action" 的
原文：http://support.microsoft.com/?id=909455在 wss v2 sp2(moss2003) 中以及之后的版本都会出现这个错误
wss sp2 的安全性被增强了，所以会出现这样的异常信息：
Microsoft.SharePoint.SPException: Cannot complete this action.Please try again.
---> System.Runtime.InteropServices.COMException (0x80004005): Cannot complete this action.Please try again.
at Microsoft.SharePoint.Library.SPRequestInternalClass.CalculatePermissionsForCurrentThread(Object& pvarAcl, Boolean bOnlyAces, UInt64& pPermGrant, UInt64& pPermDeny, Boolean& pbIsSiteAdmin, Boolean& pbIsSiteAuditor)
at Microsoft.SharePoint.Library.SPRequest.CalculatePermissionsForCurrentThread(Object& pvarAcl, Boolean bOnlyAces, UInt64& pPermGrant, UInt64& pPermDeny, Boolean& pbIsSiteAdmin, Boolean& pbIsSiteAuditor)
--- End of inner exception stack trace ---
解决办法：
using System.Security.Principal
WindowsImpersonationContext wic = WindowsIdentity.GetCurrent().Impersonate();
//implement OM code here
wic.Undo();
这个问题困扰了我好几天了，昨天去驾校领完本，下午心惊胆战的过了一下车隐，晚上又心情大好的穿齐了8件T6。今天早上又顺利的 Google 到微软的 KB。啊哈哈，这两天实在是好日子呀。
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