Can't Tween Trail's Transparency Property

Is there really any way to tween trail’s transparency? I’m trying to make the trail more transparent to show the power-up’s timer, basically the speedboost fading away.
screenshots showing the error and tween’s goal


изображение

an alternative would be to use a for i loop:

for i = 1,10 do
	beam.Transparency += NumberSequence.new(.1,.1)
	task.wait(.1)
end

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