WINDOWS日志中出现以下错误是什么原因呢

导致的结果是IIS重启。
日志名称: Application
来源: System.ServiceModel 4.0.0.0
日期: 2015/1/15 16:21:08
事件 ID: 1
任务类别: (5)
级别: 错误
关键字: 经典
用户: NETWORK SERVICE
计算机: WIN
描述:
A Webhost unhandled exception occurred.
Sender Information: System.AppDomain/19910046
Exception: System.AggregateException: A Task's exception(s) were not observed either by Waiting on the Task or accessing its Exception property. As a result, the unobserved exception was rethrown by the finalizer thread. ---> System.NullReferenceException: Object reference not set to an instance of an object.
at Kingdee.K3.MFG.BusinessCommon.BillPlugIn.Common.ProgressFormCommonPlugIn.AsyncCallback(AsynResult result)
at System.Threading.Tasks.Task.Execute()
--- End of inner exception stack trace ---
at System.Threading.Tasks.TaskExceptionHolder.Finalize()
---> (Inner Exception #0) System.NullReferenceException: Object reference not set to an instance of an object.
at Kingdee.K3.MFG.BusinessCommon.BillPlugIn.Common.ProgressFormCommonPlugIn.AsyncCallback(AsynResult result)
at System.Threading.Tasks.Task.Execute()<---

Process Name: w3wp
Process ID: 5880

事件 Xml:



1
2
5
0x80000000000000

15381
Application
WIN



System.AppDomain/19910046
System.AggregateException: A Task's exception(s) were not observed either by Waiting on the Task or accessing its Exception property. As a result, the unobserved exception was rethrown by the finalizer thread. ---> System.NullReferenceException: Object reference not set to an instance of an object.
at Kingdee.K3.MFG.BusinessCommon.BillPlugIn.Common.ProgressFormCommonPlugIn.AsyncCallback(AsynResult result)
at System.Threading.Tasks.Task.Execute()
--- End of inner exception stack trace ---
at System.Threading.Tasks.TaskExceptionHolder.Finalize()
---> (Inner Exception #0) System.NullReferenceException: Object reference not set to an instance of an object.
at Kingdee.K3.MFG.BusinessCommon.BillPlugIn.Common.ProgressFormCommonPlugIn.AsyncCallback(AsynResult result)
at System.Threading.Tasks.Task.Execute()<---

w3wp
5880

日志名称: Application
来源: ASP.NET 4.0.30319.0
日期: 2015/1/15 16:21:08
事件 ID: 1325
任务类别: 无
级别: 错误
关键字: 经典
用户: 暂缺
计算机: WIN
描述:
An unhandled exception occurred and the process was terminated.

Application ID: /LM/W3SVC/1/ROOT/K3Cloud

Process ID: 5880

Exception: System.AggregateException

Message: A Task's exception(s) were not observed either by Waiting on the Task or accessing its Exception property. As a result, the unobserved exception was rethrown by the finalizer thread.

StackTrace: at System.Threading.Tasks.TaskExceptionHolder.Finalize()

InnerException: System.NullReferenceException

Message: Object reference not set to an instance of an object.

StackTrace: at Kingdee.K3.MFG.BusinessCommon.BillPlugIn.Common.ProgressFormCommonPlugIn.AsyncCallback(AsynResult result)
at System.Threading.Tasks.Task.Execute()
事件 Xml:



1325
2
0
0x80000000000000

15382
Application
WIN



An unhandled exception occurred and the process was terminated.

Application ID: /LM/W3SVC/1/ROOT/K3Cloud

Process ID: 5880

Exception: System.AggregateException

Message: A Task's exception(s) were not observed either by Waiting on the Task or accessing its Exception property. As a result, the unobserved exception was rethrown by the finalizer thread.

StackTrace: at System.Threading.Tasks.TaskExceptionHolder.Finalize()

InnerException: System.NullReferenceException

Message: Object reference not set to an instance of an object.

StackTrace: at Kingdee.K3.MFG.BusinessCommon.BillPlugIn.Common.ProgressFormCommonPlugIn.AsyncCallback(AsynResult result)
at System.Threading.Tasks.Task.Execute()