TweenService CFrame

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#1

Hello i want to make this object rotate and it kinda bad (i am beginner TweenService)
when you press R the model should rotate 45+ every time you press

local HumanoidRootPartH = ClientTower:WaitForChild("HumanoidRootPart")
				UIS.InputBegan:Connect(function(input)
							if input.KeyCode == Enum.KeyCode.R then
								local rotationspeed = 45
								
								local TweenService = game:GetService("TweenService")
								local Tweeninfor = TweenInfo.new(1,Enum.EasingStyle.Linear,Enum.EasingDirection.In,1,false,0)
								local RotateGA = {
									CFrame = HumanoidRootPartH.CFrame * CFrame.Angles(0,45,0)
								}
								local Tween = TweenService:Create(HumanoidRootPartH,Tweeninfor,RotateGA):Play()
								print(Tween)
								
								if PlacingTower == true then
									print("none")
									end
						end 
				end)

No Error but Tween is nill

#2

In your script, Tween is not an object but rather a function, instead you should do

local Tween = TweenService:Create(HumanoidRootPartH,Tweeninfor,RotateGA)
print(Tween)
Tween:Play()

Also CFrame.Angles() uses radians instead of degrees, so you should use math.rad to convert it, like CFrame.Angles(0,math.rad(45),0)