Export excel through NAS in NAV 2013 R2

Please help!

I want to upload the data to a file excel template through NAS, but an error in XlHelper.CallOpen(XlAppRTC,FileName). (all dotnet RunOnClient = no)

Message: Cannot create an instance of the following .NET Framework: сборка Microsoft.Dynamics.Nav.Integration.Office, Version=7.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, тип Microsoft.Dynamics.Nav.Integration.Office.Excel.ExcelHelper.

Type: System.IO.FileNotFoundException
Message: Could not load file or assembly 'Microsoft.Dynamics.Nav.Integration.Office, Version=7.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
FileName: Microsoft.Dynamics.Nav.Integration.Office, Version=7.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
FusionLog:


c al code

IF FileName = '' THEN
ERROR(EmptyFileNameErr);

XlAppRTC := XlAppRTC.ApplicationClass;
IF ISNULL(XlAppRTC) THEN
ERROR(ExcelNotFoundErr);

XlHelper.CallOpen(XlAppRTC,FileName);
XlWrkBkRTC := XlAppRTC.ActiveWorkbook;

What could be the reason?