document found some problems

We are sorry, We cant open xxx.docx because we found a problem with its contents but i aint some problem with my document i can open it on my desktop?

 using (SPWeb web = mysites.RootWeb)
                        {
                            using (mysites.OpenWeb())
                            {

                                SPList list = web.Lists["myList"];

                                string file = fileName;

                                Stream fStream = File.OpenRead(file);
                                var byteArray = new byte[fStream.Length];
                                string filename = System.IO.Path.GetFileName(file);
                                fStream.Close();
                                if (filename != null)
                                {


                                    string fileUrl = list.RootFolder.Url + "/" + filename;
                                    SPFile fileSp = list.RootFolder.Files.Add(fileUrl, byteArray, true);
                                    SPListItem item = fileSp.Item;
                                    item["Name"] = fileSp.Name;


                                    item.Update();


                                }
                            }