Chat Script Not Working At All?

In A ServerScript:

local CE = game.ReplicatedFirst.ChatEvent

function UpdateOldLabels(Parent)
    for i,v in pairs(Parent:GetChildren()) do
        if v.Name:sub(1,4):lower() == "line" then
            local LineNumber = v.Name:sub(5)
            if LineNumber == "6" then
                v:Destroy()
            else
                v.Name = "line"..tostring(tonumber(LineNumber) + 1)
                v.Position = v.Position - UDim2.new(0,0,0,30)
            end
        end
    end
end

function SC(instance, player, message, color,)
    UpdateOldLabels(instance)
    local TL = Instance.new("TextLabel")
    TL.Parent = instance
    TL.BackgroundTransparency = 1
    TL.Font = Enum.Font.SourceSansBold
    TL.FontSize = Enum.FontSize.Size18
    TL.Text = "["..player.Name.."]: "..message
    TL.TextColor = color
    TL.TextXAlignment = Enum.TextXAlignment.Left
    TL.TextYAlignment = Enum.TextYAlignment.Top
    TL.TextStrokeTransparency = 0.7
    TL.ClipsDescendants = false
    TL.Size = UDim2.new(1,0,0,30)
    TL.Position = UDim2.new(0,0,1,-30)
    TL.Name = "line1"
end

CE.OnServerEvent:connect(function(player, message, color)
    for i,v in pairs(game.Players:GetChildren()) do 
        local PG = v:WaitForChild("PlayerGui")  
        local CG = PG:WaitForChild("Chat")  
        SC(CG.GlobalChat, player, message, color)
    end
end)

In a LocalScript:

local P = game.Players.LocalPlayer
local TB = script.Parent.TextBox
local UIS = game:GetService("UserInputService")
local CE = game.ReplicatedFirst.ChatEvent
local CC = P.TeamColor

UIS.InputBegan:connect(function(input)
 if input.UserInputType == Enum.UserInputType.Keyboard and input.UserInputState == Enum.UserInputState.Begin and input.KeyCode == Enum.KeyCode.Slash then
    TB:CaptureFocus()
end
end)

TB.FocusLost:connect(function(enterpress)
    if enterpress then
        CE:FireServer(TB.Text, CC)
        wait(0.03)
        TB.Text = "Click here or press the '/' key to chat."
    else
        TB.Text = "Click here or press the '/' key to chat."        
    end
end)

It works in studio, but when I go into a game, the messages don't send through.