creating word instance giving error

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C#

C#4.0

ASP.NET4

Hi All,

i am creating the word instance in my application, when i am creating
the word instance at my development environment then everything work ok.

but when i create the setup and host in iis,
when i run the application from iis then fallowing error come

System.FormatException: Index (zero based) must be greater than or equal to zero and less than the size of the argument list.

what should i do to resolve this issue?

Code:

public void Open() {
try {

// Create the Word application by using inline initialization.
Microsoft.Office.Interop.Word.Application _oApplication = new Microsoft.Office.Interop.Word.Application();
_oApplication.NormalTemplate.Saved = true;
}
catch(Exception e) {
throw e;
}
}