Referencing Table Variable's CFrame not working?

I'm making a security camera script and the output is printing this: Players.NiroTurtle.PlayerGui.CameraGui.LeftButton.CamScript:11: attempt to index field '?' (a nil value) I'm trying to make it so when you click the arrow, the next thingy in the table will be the camera's new CFrame. Here's the code. Please help!!!!!

local plr = game.Players.LocalPlayer
local cam = workspace.CurrentCamera
local currentCam = 1
local button = script.Parent
local camFolder = game.Workspace.Cameras
local cameras = {camFolder.Camera1.SecCamPart, camFolder.Camera2.SecCamPart, camFolder.Camera3.SecCamPart, camFolder.Camera4.SecCamPart, camFolder.Camera5.SecCamPart, camFolder.Camera6.SecCamPart}

button.MouseButton1Click:Connect(function()
	if button.Text == "<" then
		if currentCam - 1 <= 0 then
			cam.CFrame = cameras[6].CFrame
			cam.CameraType = Enum.CameraType.Scriptable
		    plr.CameraMode = "LockFirstPerson"
		else
			cam.CFrame = cameras[currentCam - 1].CFrame
			cam.CameraType = Enum.CameraType.Scriptable
		    plr.CameraMode = "LockFirstPerson"
		end
	else
		if currentCam + 1 >= 7 then
			cam.CFrame = cameras[1].CFrame
			cam.CameraType = Enum.CameraType.Scriptable
		    plr.CameraMode = "LockFirstPerson"
		else
			cam.CFrame = cameras[currentCam + 1].CFrame
			cam.CameraType = Enum.CameraType.Scriptable
		    plr.CameraMode = "LockFirstPerson"
		end
	end
end)