Com Exception: Word was unable to read this document. It may be corrupt.

Question

I have a web app that takes some client info and produces a letter for each client. Everything works good in my test environment, but on the production server I get an error that says the file is corrupt. I can open the .dotx file in word just fine on the server but not via code. Please help. Here is my code:

Object oMissing = System.Reflection.Missing.Value;

            Object oTrue = true;
            Object oFalse = false;

            Word.Application oWord = new Word.Application();
            Word.Document oWordDoc = new Word.Document();


            oWord.Visible = false;

            Object oTemplatePath = Request.PhysicalApplicationPath + "letters\\" + letter.letter_data; //samplehollisletter.dotx";

            oWordDoc = oWord.Documents.Add(ref oTemplatePath, ref oMissing, ref oMissing, ref oMissing);

            foreach (Word.Field myMergeField in oWordDoc.Fields)
            {

                iTotalFields++;
                Word.Range rngFieldCode = myMergeField.Code;
                String fieldText = rngFieldCode.Text;

                if (fieldText.StartsWith(" MERGEFIELD"))
                {

                    Int32 endMerge = fieldText.IndexOf("\\");
                    Int32 fieldNameLength = fieldText.Length - endMerge;
                    String fieldName = fieldText.Substring(11, endMerge - 11);

                    fieldName = fieldName.Trim();

                    if (fieldName == "letter_title")
                    {
                        myMergeField.Select();
                        oWord.Selection.TypeText(acct.letter_title);
                    }
                    if (fieldName == "account_id")
                    {
                        myMergeField.Select();
                        oWord.Selection.TypeText(acct.account_id);
                    }

                    if (fieldName == "address")
                    {
                        myMergeField.Select();
                        oWord.Selection.TypeText(acct.PEOPLE.home_address + "\r\n" + acct.PEOPLE.home_city + ", " + acct.PEOPLE.home_state + " " + acct.PEOPLE.home_zip);
                    }

                    if (fieldName == "greeting_title")
                    {
                        myMergeField.Select();
                        oWord.Selection.TypeText(acct.greeting_title);
                    }

                    if (fieldName == "service_name")
                    {
                        myMergeField.Select();
                        oWord.Selection.TypeText((acct.SERVICEs.FirstOrDefault()).service_name);
                    }

                    if (fieldName == "service_date")
                    {
                        myMergeField.Select();
                        oWord.Selection.TypeText((acct.SERVICEs.FirstOrDefault()).service_date.ToString());
                    }


                }
            }
            oWordDoc.PrintOut();
            oWordDoc.Close(Microsoft.Office.Interop.Word.WdSaveOptions.wdDoNotSaveChanges);
            Thread.Sleep(2000);
            oWord.Quit();

The Error is:

Server Error in '/Tracker2' Application. 

Word was unable to read this document. It may be corrupt. Try one or more of the following: * Open and Repair the file. * Open the file with the Text Recovery converter. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Runtime.InteropServices.COMException: Word was unable to read this document. It may be corrupt. Try one or more of the following: * Open and Repair the file. * Open the file with the Text Recovery converter.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[COMException (0x800a141f): Word was unable to read this document. It may be corrupt. Try one or more of the following: * Open and Repair the file. * Open the file with the Text Recovery converter.] Microsoft.Office.Interop.Word.Documents.Add(Object& Template, Object& NewTemplate, Object& DocumentType, Object& Visible) +0 Tracker.RunLetter2.Button1_Click(Object sender, EventArgs e) in C:\Users\Ethan\Documents\Visual Studio 2010\Projects\EstateTracker\Tracker\RunLetter2.aspx.cs:52 System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +154 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3691