Apparently...

The Error:

Error number: -2146827839
Event: Execution of line 3 column 1
Description: Argument not optional: 'world.queue'
Line in error:

Called by: Immediate execution

<triggers>
<trigger
enabled="y"
group="TrainingSwitch"
match="They aren't here."
send_to="12"
sequence="100"
other_text_colour="black"
other_back_colour="black"
>
<send>dim count
for count = 1 to CInt(world.getvariable (&quot;DeathWalk&quot;))
world.queue &quot;east&quot;
world.queue &quot;west&quot;
next
world.queue &quot;sleep&quot;</send>
</trigger>
</triggers>

The Trigger and script.

See:

http://www.gammon.com.au/scripts/doc.php?function=Queue

You have left an argument off.

Ahh.... Gottcha.

No biggie. Easy fix.