“調用的目標發生了異常”問題

首先原諒我將該問題放在首頁，情況緊急，實在是沒辦法了，請各位幫忙！

我用下面語句來建立類型的一個執行個體：
ClassA Obj = (ClassA)Activator.CreateInstance(tasktype);
其中tasktype是Type類型

在執行上述語句時拋出異常：
Exception has been thrown by the target of an invocation.. （調用的目標發生了異常）

我在本地是好的，但在伺服器上卻拋出該異常。

伺服器環境：
windows 2003 作業系統
.net FrameWork 2.0 + sp1補丁

請問這會是什麼原因導致，該問題已經困擾我很長時間了。

 

以下是伺服器“事件檢視器”中日誌資訊：異常的Source、Message、StackTrace：
Source：mscorlib,
Message:Exception has been thrown by the target of an invocation.,
StackTrace: at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandle& ctor, Boolean& bNeedSecurityCheck)
at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean fillCache)
at System.RuntimeType.CreateInstanceImpl(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean fillCache)
at System.Activator.CreateInstance(Type type, Boolean nonPublic)
at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at System.Reflection.Assembly.CreateInstance(String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at TaskScheduler.TTaskManager.PrepareTaskQueue() in c:\TaskScheduler\TaskManager.cs:line 94
at TaskScheduler.TTaskManager..ctor() in c:TaskScheduler\TaskManager.cs:line 64
at TaskScheduler.TTaskScheduler.RunTasks(Object sender) in c:\TaskScheduler\TaskScheduler.cs:line 58.