SC2Mapster

I'm trying to make a dialogue window that pops up when a unit is loaded into another unit with specific information about the cargo unit. I'm doing this through a trigger that fires when a unit uses the load command, then sets the loaded unit in a variable and goes through a switch statement with cases for each unit type to decide what to show.

I'm having trouble getting around a particular bug, though: despite the trigger firing on a "unit uses ability (Load) at the Generic6 - Complete stage" even the game refuses to acknowledge that the loading unit has a cargo unit, and has instead decided to gurgle Array Index Out Of Bounds errors at me. Here's the trigger in question:

    Events
        Unit - Any Unit uses  Load (Command Center) at Generic6 - Complete stage (Ignore shared abilities)
    Local Variables
        p = 0 <Integer>
        cargo unit = No Unit <Unit>
    Conditions
    Actions
        UI - Display "[show window] running..." for (All players) to Subtitle area
        Variable - Set p = ((Owner of (Triggering unit)) - 1)
        Variable - Set cargo unit = (Cargo unit in (Triggering unit) at slot 1)
        General - Switch (Actions) depending on (Unit type of cargo unit)
            Cases
                General - If (Infantry)
                    Actions
                        UI - Display "[show window] in Infantry switch case..." for (All players) to Subtitle area
        Dialog - Show unitCarriedDialog[p] for (Player group((Owner of (Triggering unit))))

the line that's giving me the problems is

        Variable - Set cargo unit = (Cargo unit in (Triggering unit) at slot 1)

it returns the following error whenever the trigger fires:

00:00:11.25 Trigger Error in 'gt_changeunitcarriedwindowshow_Func': Parameter out of bounds in 'UnitCargo' (value: 0, min: 0, max: -1)

This error leads me to believe the trigger doesn't believe the unit has cargo at the moment, as the parameter requirements for the UnitCargo call are impossible to satisfy. I don't really know how to get around this! I've tried changing the line to get the unit from a conversion from unit to unit group of from the Triggering Unit's Cargo unit group, which doesn't throw errors but also doesn't work as the found unit only triggers the default switch block. Is there any other way to deal with this?

I've done a bit more testing and I've managed to avoid getting an error by replacing the problem line with this line:

Variable - Set cargo unit = (Unit 1 from (Cargo units in (Triggering unit)))

However I've been watching the variable in the debug window and it never changes in value from null. This leads me to believe that the trigger executes after the ability finishes but before the unit is actually placed into cargo. I've tried changing the event ability stage around but I get the same results or worse with other options.

Quote from LaurenI: Go

This leads me to believe that the trigger executes after the ability finishes but before the unit is actually placed into cargo.

try some wait 0-0.1 then

also isn't cargo unit the target of Load ability? even when it comes from the actual unit

Wow, cool! The wait thing worked. I'd tried something similar earlier but had no results, which probably means I screwed it up somewhere that time. Oh well!

Thanks for the help!