Why doesn't my special effect go away?

Why doesn't my special effect go away?

Don't know what the hell I'm doing wrong but a special effect I create at the target point of one of my spells doesn't go away when it's supposed to. Seems like a simple thing but I don't know why it doesn't go away.

Here is the trigger.

EVENTS - Unit - A unit begins casting an ability
CONDITIONS - (Ability being cast)Equal to nuclear strike terran
ACTIONS - Special effect - create a special effect at (Target point of ability being cast) using .....Devotion aura.mdl

Wait 10 seconds

Special effect - Destroy(last created special effect)

Seems pretty straight forward but the effect won't go away and I don't know why. Does anyone else know?

Set it as a variable, or even better, a dummy unit with locust as devotion, but with a 10 second expiration timer. Then you could get the nuke to target the beacon as well

Yeah I did the dummy unit thing with locust, invulnerability and set the model to devotion aura and it works just like i wanted. Thanks alot dude