[Trigger] Why wont this work?

[noob134]

I am making a spell and whenever i set a condition to check if a unit is alive when setting my unit group it wont select any units. Please help.. here is an example:

• Example Spell
  • Events
    • Unit - A unit Starts the effect of an ability
  • Conditions
    • (Ability being cast) Equal to War Stomp
  • Actions
    • Set Temp_Point = (Position of (Triggering unit))
    • Set UnitGroup = (Units in (Region centered at Temp_Point with size (500.00, 500.00)) matching (((Picked unit) is alive) Equal to True))
    • Unit Group - Pick every unit in UnitGroup and do (Actions)
      • Loop - Actions
        • Unit - Cause (Triggering unit) to damage (Picked unit), dealing 500.00 damage of attack type Spells and damage type Normal
    • Custom script: call RemoveLocation(udg_TempPoint)
    • Custom script: call DestroyGroup(udg_UnitGroup)

why wont this work
please tell me how to fix!

 

[aznricepuff]

Use Matching unit in the unit group condition, not picked unit.