Make sure you have access rights to view and download data online. Check your permissions with Server Administrator
Raja Usman Ali
I've all the access to the workbook.
Do a 'simple' test to make sure the extract has records but creating a new sheet and then adding the 'Number of Records' to the text so the report will display the total number of records in the extract. If there is a record number count, you can go directly to the download option and select full data, this should give you a filled text file of all the columns available in the extract. If this works, then you can start to add your filters to get only the data you need in an extract.
However, like Usman suggested, even though you may have access to the workbook you may not have access to 'download' the full data. It is a security setting that SA's apply to users or user groups on the server.