Configuration :: Unspecified Error While Uploading Excel And Connecting It To Dataset

I am facing some problem while uploading excel sheet upload and connecting it to dataset. The Code works fine in local machine but on website its showing following error.

System.Data.OleDb.OleDbException: Unspecified error at System.Data.OleDb.OleDbConnectionInternal

Below is my code:

string FileName = Path.GetFileName(FileUpload1.PostedFile.FileName);
string Extension = Path.GetExtension(name);
string FolderPath = ConfigurationManager.AppSettings["FolderPathSMS"];
string FilePath = Server.MapPath(FolderPath + FileName);
switch (Extension)
{
case ".xls": //Excel 97-03
s = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + FilePath + ";Extended Properties='Excel 8.0;HDR={1}'";
break;
case ".xlsx": //Excel 07
s = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + FilePath + ";Extended Properties='Excel 8.0;HDR={1}'";
break;
}
EDT = new DataTable();
EDT.Columns.Add("MobileNo", typeof(string));
con = new OleDbConnection(s);
con.Open(); // I am getting the error at this point
da = new OleDbDataAdapter("select * from [Sheet1$]", con);
ds = new DataSet();
da.Fill(ds);

string FileName = Path.GetFileName(FileUpload1.PostedFile.FileName);
string Extension = Path.GetExtension(name);
string FolderPath = ConfigurationManager.AppSettings["FolderPathSMS"];
string FilePath = Server.MapPath(FolderPath + FileName);