I'm doing a 911 System and a error pops up... What the error?

Hi. I am doing a 911 System. Look at this script:

button = script.Parent.Callbutton
locationbox = script.Parent.LocationBox
typeofemergencybox = script.Parent.EmergencyTypeBox
describesittuationbox = script.Parent.DescribeSituationBox
line1 = script.Parent.Parent.OperatorFrame.line1
line2 = script.Parent.Parent.OperatorFrame.line2
line3 = script.Parent.Parent.OperatorFrame.line3
line4 = script.Parent.Parent.OperatorFrame.line4
line5 = script.Parent.Parent.OperatorFrame.line5
line6 = script.Parent.Parent.OperatorFrame.line6
line7 = script.Parent.Parent.OperatorFrame.line7

location = nil
typeofemergency = nil
describesittuation = nil

button.MouseButton1Click:connect(function()
    location = locationbox
    typeofemergency = typeofemergencybox
    describesittuation = describesittuationbox

    line1.Text = line2.Text
    line2.Text = line3.Text
    line3.Text = line4.Text
    line4.Text = line5.Text
    line5.Text = line6.Text
    line6.Text = line7.Text
    line7.Text = "%name%, ".."called for 911, Type Of Emergency: "..typeofemergency..", location: "..location..", Sittuation: "..describesittuation.."!"
end)

It is using a Script not local script because I want it to happen serverside and not local. So then this error pops up:

16:53:07.877 - Players.iiLevelMaker.PlayerGui.ScreenGui.Main.Script:28: attempt to concatenate global 'describesittuation' (a userdata value)