Export to multiple sheet in excel - Nav 2018

I'm looking for an exemple of how to export data to excel in Navision 2018 using multiple sheets.
We have a custom report for one of our client in nav 2013 R2 that export orders informations to different excel spreadsheet.
Now that we are upgrading them to 2018, the code is not working anymore

Here is part of the code in 2013 R2 that is working fine:
ExcelBuf.OnlyCreateBook('ABC', 'ABC',COMPANYNAME, USERID,TRUE);
ExcelBuf.DELETEALL;

Here is the error message we get in 2018 when running the same report


Here is where in the code of the excel buffer table it's failing