COMException (0x800A13E9) - Word interop services

Question

I am getting this stacktrace:

System.Runtime.InteropServices.COMException (0x800A13E9): Word ðú÷ì ááòéä.
   at Microsoft.Office.Interop.Word.Documents.Add(Object& Template, Object& NewTemplate, Object& DocumentType, Object& Visible)
   at Crm.DocumentGeneration.Printing.DocumentsPrinter.MergeDocuments(ApplicationClass& wordApp, IEnumerable`1 printDataItems, String tempDirectory, String template) in C:\Work\Danel.Nursing\Crm.DocumentGeneration.Printing\DocumentsPrinter.cs:line 249

After googling a bit it seems that COMException (0x800A13E9) is out of memory exception but there is enough memory on the server to launch a spaceship 8192 spaceships.
Here is the function call:

Document document = wordApp.Documents.Add(ref defaultTemplate, ref missing, ref missing, ref missing);

Nothing is null or invalid with defaultTemplate, I checked.

Answer 1

Here's the solution I found:

1. Put a folder called Desktop on C:\Windows\SysWOW64\config\systemprofile (Yes I know. WTF?)
2. Open Regedit, Go to HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppId and edit the two enteries that have a Guid ending with 46. Delete every key they have and add a new key called RunAs with the value of Interactive User

After that, start praying. It doesn't work if you access through a terminal server. Which is kind of a problem for me hehe.

EDIT: The problem with the terminal server was that only an Administrator is allowed to raise COM objects so what you have to do is impersonate to an Administrator.