"expected ")" at line 17 got "="" and "expected identifier when parsing expression got "}" " all at line 47 - roblox

Question

i have problems with the line with the properties variable. it says at line 17 there was a ( in there but when i checked there wasnt. then at the end of the variable i put a } to close the table but it says it expected a identifier when parsing the expression (its a statement).
take a look at the entire script. there is no ( at line 17
`
local gui=script.Parent
local screengui=gui.Parent
local energy=100
local maxenergy=100
local shifton=0
local player=game.Players.LocalPlayer
local char=player.Character
local human=char:WaitForChild("Humanoid")
local userinput=game:GetService("UserInputService")
local function keystart(input,gameproccess)
if not gameproccess then
if input.UserInputType==Enum.UserInputType.Keyboard then
local keycode=input.KeyCode
if keycode==Enum.KeyCode.RightShift then
shifton=1
end
end
end
end
local function keyend(input,gameproccess)
if not gameproccess then
if input.UserInputType==Enum.UserInputType.Keyboard then
local keycode=input.KeyCode
if keycode==Enum.KeyCode.RightShift then
shifton=0
end
end
end
end
userinput.InputBegan:Connect(keystart)
userinput.InputEnded:Connect(keyend)
while true do
if shifton==1 and energy>0 then
human.WalkSpeed=16
energy-=0.1
else
human.WalkSpeed=10
shifton=0
if energy<maxenergy-1 then
energy+=0.1
else
energy=100
end
end
local property={gui.Size.X=UDim2.new(guienergy,0,0.05,0).X}
local part=script.Parent
local TweenInf=TweenInfo.new(1,Enum.EasingStyle.Exponential,Enum.EasingDirection.InOut,-1,true,0)
guienergy=((energy/maxenergy)*0.9)
tween=game.TweenService:Create(part,TweenInf,property)
tween:Play()
wait(0)
end
`