HumanoidRootPart tween going crazy

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#1

I was trying to make it so this worm thing would lunge out at players using a CFrame tween, but when I ran it the worm would teleport to a random distance instead.

wait(10)
game:GetService("TweenService"):Create(script.Parent.HumanoidRootPart, 
TweenInfo.new(1), {CFrame = CFrame.new(Vector3.new(-840.266, -794.696, 
675.583), Vector3.new(-840.266, -794.696, 675.583))}):Play()

What happens

Nothing comes up in the output
Thanks in advance

#2

The problem is that your CFrame constructor is using the lookAt format, but your two Vector3 points are the same. Replace that code with CFrame = CFrame.new(Vector3.new(-840.266, -794.696, 675.583), Vector3.new(-840.266, -795, 675.583))
or
CFrame = CFrame.new(Vector3.new(-840.266, -794.696, 675.583)).