the error is in the local forthgoals on Tweener1.Cframe
local newCFrame = CFrame.Angles(math.rad(-10),0,0)
local InfoAngle = TweenInfo.new(2.3, Enum.EasingStyle.Linear, Enum.EasingDirection.Out, 0, false, 0 )
local PartAngleA = TweenService:Create(Tweener1,InfoAngle, ForthGoals )
local ForthGoals = { Tweener1.CFrame = Tweener1.CFrame * newCFrame }
wait(1)
PartAngleA:play()