General Input/Output Error Problem

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C#

ASP.NET

OpenOffice

OpenXML

General Input/Output Error Problem help me

Im generating docx file using Open XML

When i open the file in Oppenoffice,org Writer

its throw General Input/Output Error

My code

public void WordprocessingFromString(string InputPath, string OutputPath, string InputDir)
        {          
            using (WordprocessingDocument myDoc = WordprocessingDocument.Create(OutputPath, WordprocessingDocumentType.Document))
            {
                MainDocumentPart mainPart = myDoc.AddMainDocumentPart();                mainPart.Document = new Document();
                Body body = new Body();
                Text heading_text = new Text("Test by amal..");
                ParagraphProperties heading_pPr = new ParagraphProperties();
                body.Append(heading_text);
                mainPart.Document.Append(body);
                mainPart.Document.Save();
            }
        }

Thanks in advance