I'm trying to make a simple Asteroid game with the BGE, using Python when necessary. I want to make 'visible' the ship trails when I press 'W' to increase the speed and make them 'invisible' if 'W' is not pressed. Where is the error? I'm very new with Python scripts. 
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You can do:
own['trails'] = trailsObject
own['trails'].visible = True
own['trails'].visible = False
or as i can see in the image:
cont.activate(trails) # to activate the actuator
cont.deactivate(trails) # to deactivate the actuator
Also visit the BGE Documentation.
Next time please take a moment to copy your code as text and format it.
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You should have own.setVisible not setVisibility.
import bge
cont = bge.logic.getCurrentController()
own = cont.owner
wKey = cont.sensors['wKey']
if wKey.positive:
own.setVisible(True)
else:
own.setVisible(False)
That way you don't need the visibility actuator.
