Has anyone run into a problem with filtering and getPortalReportDataSubset?

Hello there,
Has anyone run into a problem with filtering and getPortalReportDataSubset? I'm trying to add a filter to a report (which I have verified via the portal interface) however whenever I do I get an error saying that 'the passed parameters are of the wrong type'. I've used the examples provided in the documentation and on forum (forum.appian.com/.../e-117070) with no success. Does anyone have any suggestions?

local!filters: if(local!selectedREITID = -1, {}, { field: "7", operator: "EQUAL", value: 21 }),
local!results: getPortalReportDataSubset(
reportID: cons!REPORT_CURRENT_TASKS,
pagingInfo: local!pagingInfo,
filters: local!filters
),...

OriginalPostID-120399

OriginalPostID-120399