StringValue in game won't change?

local crateValue = game.Players.LocalPlayer:WaitForChild("stats").CrateValue
local event = game.ReplicatedStorage.ChangeCrate
local cameras = workspace:WaitForChild('Cameras')
local camera1 = cameras:WaitForChild('Camera1')
local camera2 = cameras:WaitForChild('Camera2')
local camera3 = cameras:WaitForChild('Camera3')
local camera4 = cameras:WaitForChild('Camera4')
local camera5 = cameras:WaitForChild('Camera5')
local camera6 = cameras:WaitForChild('Camera6')
local camera7 = cameras:WaitForChild('Camera7')
local camera = workspace.CurrentCamera
local plr = game.Players.LocalPlayer
script.Parent.MouseButton1Click:Connect(function()
if crateValue.Value ~= "Rainbow Crate" then
	if crateValue.Value == "Medium Crate" then
		lerpCam(camera2,camera3)
		event:FireServer(plr,"Large Crate")
		else if crateValue.Value == "Large Crate" then
				lerpCam(camera3,camera4)
				event:FireServer(plr,"Insane Crate")
			else if crateValue.Value == "Insane Crate" then
					lerpCam(camera4,camera5)
					event:FireServer(plr,"Bronze Crate")
				else if crateValue.Value == "Bronze Crate" then
						lerpCam(camera5,camera6)
						event:FireServer(plr,"Silver Crate")
					else if crateValue.Value == "Silver Crate" then
							lerpCam(camera6,camera7)
							event:FireServer(plr,"Rainbow Crate")
						else if crateValue.Value == "Small Crate" then
								event:FireServer(plr,"Medium Crate")
								lerpCam(camera1,camera2)
							else
								
						end
					end
				end
			end
		end
	end
	end
end)

function lerpCam(cam1,cam2)
	for Num = 0,1,0.1 do
		camera.CFrame = cam1.CFrame:lerp(cam2.CFrame,Num)
		wait()
	end
end

Event fired here ^

game.ReplicatedStorage.ChangeCrate.OnServerEvent:Connect(function(plr,plr1,str)
	local stats = plr:WaitForChild("stats").CrateValue
	stats.Value = str
end)

Code activates here. It doesn't work in my game, what is wrong with it?

https://scriptinghelpers.org/questions/107969/invalid-argument-3-string-expected-got-instance

The exact same answer applies here.