Yes, that's what I suspected. Would be hard to find out the exact problem.

Do you have a lot of code in Page_Load?

>The error occurs on the customer system so I can't use debugger.
>
>>Can you reproduce this error while debugging the application?
>>
>>>Hi,
>>>
>>>The ASP.NET application gets an error message where the top two lines of the error are:
>>>
>>>

>>>[Null ReferenceException: Object reference not set to and instance on an object]
>>>MyApplication.MyPage.Page_Load( Object sender, Event Args e) + 139
>>>

>>>
>>>I was hoping that 139 is the line of code where the error occurs but page MyPage.aspx.cs does not even have line 139. What is the meaning of "139" and how to find where (on what line) the program runs into the error?
>>>
>>>Thank you.