Hi folks, can someone help me? What is wrong?
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On line 17 you already get the position with
local p = go.get_position()
As shown in the documentation for go.get_position(), it accepts a url, not a vector object as you are doing on line 18.
On line 18, you take a vmath vector named p, another vmath vector name self.dir and multiply them by two values. The result of this operation is another vector. I am assuming on line 18 you instead wanted go.set_position(), for it seems as if you are calculating their next position using their direction and velocity.
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At line 18, you typed
go.get_position(p + self.dir * speed * dt)
instead of
go.set_position(p + self.dir * speed * dt)
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Ohhhhh 
… thank you. It working now!
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