make sure not to extract the zip file before using it.
when importing the preset, you need to select the zip file itself, not the folder that is inside the zip file.
if you extract the zip, you will get that error.
If you where to add the select list to the details page instead of using the results page, the list should work without the need for the nested recordset.
the nested recordset is needed on the results page because the idea of the results page is to display multiple records
"Where can i find what the variable for the recordset is set to"
in the recordset dialog box, it will show the variable being used for the recordset.