Attempted to index a nil value error help?

Ok, I'm not exactly sure what the problem is but next time show us your variables as well.

Ok the problem may be through the Instance.new(). What you want to do is instead of `instance.new('asadas',script.parent) you want to set the parent on another line (again for some reason it's probably this).

local Food = Instance.new('TextLabel')
Food.Parent = script.Parent.Parent.Parent.Parent

So your script would look like:

script.Parent.MouseButton1Click:Connect(function()
    if not exists then
    	exists = true
    	local JobPanel = Instance.new("Frame")
	JopPanel.Parent = script.Parent.Parent.Parent.Parent
    	JobPanel.BackgroundTransparency = 1
    	JobPanel.Name = "Job Panel"
	JobPanel.AnchorPoint = Vector2.new(0.5, 0.5)
    	JobPanel.Position = UDim2.new(0.5,0,0.5,0)
   	JobPanel.Size = UDim2.new(0,800,0,450)
    	local Title = Instance.new("TextLabel")
	Title.Parent = JobPanel
    	Title.BackgroundColor3 = Color3.new(255,255,255)
    	Title.Size = UDim2.new(0,750,0,30)
    	Title.Text = "Job Menu"
    	Title.TextScaled = true
    else
    	JobPanel:Destroy()
    end
end)

Now I'm not exactly sure exists actually is a variable that is false make sure it is.

Paste this code in and tell me if it errors, if it does I will get back to you. Comment below and tell me the error on which line.

Hoped this helped!