"Expression evaluation error in rule" error related to filtering

Question

Specifically Tempo Task Report. Appian Version: 7.4 (cloud) Browser: IE 11 Plug-in: Portal to SAIL. My question is regarding filtering. Whenever there is null value in the datasubset (whether by default, or through filtering, it will show an error: "Expression evaluation error in rule 'devmytaskstempo'" I am attaching my rule. I have tried to capture the empty datasubset in many was. I used isnull(local!datasubset), local!datasubset.totalCount, in the if statement. I am stuck here. Please guide me here. And let me know if you need more info.... 
 rule-devmytasktempo.txt 
 OriginalPostID-104493 
 OriginalPostID-104493

Alicia-Jane Dunn · Accepted Answer

It appears that your rule is still calling the task pagingGrid, even when the data returns null. Instead of calling the grid, try calling a readOnly text field that will inform the user that the selected filter returned "0" tasks.

Example:
if(local!datasubset.totalCount<1, rule!APN_uiTextReadOnly(label: local!datasubset.title, value: "No matching tasks returned."), {yourTaskReportScript})

Please let us know if this resolves your issue. -Alicia