I am trying cascading dropdown with query rules. I have this SAIL expression but

I am trying cascading dropdown with query rules. I have this SAIL expression but it doesn't work: could you help me? Thanks!
=load(
local!selectedFoodType: tointeger(null),
local!fruitChoice:tointeger(null),
local!vegetableChoice,
a!formLayout(
label: "SAIL Example: Cascading Dropdowns",
firstColumnContents: {
a!dropdownField(
label: "Food Type",
choiceLabels: rule!getTypeExp(),
choiceValues: rule!getTypeExp(),
placeholderLabel: "--- Select Food Type ---",
value: local!selectedFoodType,
saveInto: local!selectedFoodType
),
if(local!selectedFoodType = "",{},
a!dropdownField(
label: "Fruits",
choiceLabels:rule!getFailureDescription(local!selectedFoodType),
choiceValues: rule!getFailureDescription(local!selectedFoodType),
placeholderLabel: "--- Select Fruit Type ---",
value: local!fruitChoice,
saveInto: local!f...

OriginalPostID-96788

OriginalPostID-96788