PrimaryPart no longer exists. Please set Model.PrimaryPart before using this?

Hello, watch this error that appears here, I'm doing an obby and I created a platform and I wanted it to move and go back to the place, so I created this script:

while true do
 wait(1)
 for i= 1, 200 do
		script.Parent.CFrame = script.Parent.CFrame * CFrame.new(89.923, 0.099, 175.222)
  wait(3)
 end 
 wait(1)
 for i= 1, 200 do
		script.Parent.CFrame = script.Parent.CFrame * CFrame.new(58.457, 0.099, 175.222)
  wait(3)
 end 
end

and the error is this:

**Model:GetPrimaryPartCFrame() failed because no PrimaryPart has been set, or the PrimaryPart no longer exists. Please set Model.PrimaryPart before using this.    A primary part should be set so that the character can be spawned correctly **