Getting a Object Reference error in prod only when trying to use the Word DocumentClass

Question

I am writing a program that uses a .dotx template and does a merge of data in an aspx page. The program works perfect on my Dev workstation locally but when I deploy it to a test IIS server, it fails on the second line below giving me an Object Reference error.

I ran into problems earlier because the Word Com object was not on the IIS server so I loaded Word onto the server and set permission in DCom and got past that problem. But now I get this error on the line that starts with wRange = .....

As I said, the program works perfectly locally in debug mode.

Any ideas?

Microsoft.Office.Interop.Word.DocumentClass

System.NullReferenceException: Object reference not set to an instance of an object

lines of code:

Document BaseDocument = oWord.Documents.Open(ref oTemplate, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing);

wRange = BaseDocument.Bookmarks.get_Item(ref endOfDoc).Range;

Answer 1

1. Click Start, click Programs, click Administrative Tools, click Component Services.
2. Expand Component Services, expand Computers, expand My Computer, expand DCOM Config, and right-click Microsoft Word 97 - 2003 Document. Select Properties.
3. Click General. Set Authentication Level to Connect (None also work).
4. Click Identity. Set This user. Specify a user account that will always be used to run the COM application regardless of which user is accessing it.
5. Click button Apply.
6. Click button OK.

For more information on “Configuring DCOM for Remote Access" visit Configuring DCOM for Remote Access