帮忙分析DUMP文件

[sinmo]

环境：VS2008 C# + Windows XP
抓取到的dump文件怎么不显示我的程序DLL的方法名(Unknown部分)？
Common_Work!Unknown
(Common_Work是我的程序DLL文件)

dump文件输出
0:017> !pe
Exception object: 0111f238
Exception type: System.NullReferenceException
Message: 未将对象引用设置到对象的实例。
InnerException: <none>
StackTrace (generated):
SP IP Function
052DE580 051D2A3B Common_Work!Unknown+0xfab
052DF640 792D6D66 mscorlib_ni!System.Threading.ThreadHelper.ThreadStart_Context(System.Object)+0x66
052DF64C 792E01EF mscorlib_ni!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)+0x6f
052DF664 792D6CE4 mscorlib_ni!System.Threading.ThreadHelper.ThreadStart()+0x44

StackTraceString: <none>
HResult: 80004003
There are nested exceptions on this thread. Run with -nested for details