DE, Character = Nil?

-- Server Script
--\\ Services
local RS = game:GetService'ReplicatedStorage'
local  Players = game:GetService'Players'
--\\ Nicknames
local RF = RS.RF
--\\ Main Code
RF.OnServerEvent:connect(function(player, DE, Character)
    if player.Character.Head:FindFirstChild'BillboardGui' == nil then
    local NameTag = script.BillboardGui:Clone()
    NameTag.Frame:FindFirstChild'CharacterInformation'.Text = DE.Text
    NameTag.Frame:FindFirstChild'PlayerName'.Text = player.Name
    NameTag.Frame:FindFirstChild'CharacterName'.Text = Character.Text
    NameTag.Parent = player.Character.Head
    player:WaitForChild'leaderstats'.RPName.Value = Character.Text
    player:WaitForChild'leaderstats'.Description.Value = DE.Text
    elseif player.Character.Head:FindFirstChild'BillboardGui'  ~= nil then
        local NameTag = player.Character.Head.BillboardGui
        NameTag.Frame.CharacterInformation.Text = DE.Text
        NameTag.Frame.PlayerName.Text = player.Name
        NameTag.Frame.CharacterName.Text = Character.Text
        player:WaitForChild'leaderstats'.RPName.Value = Character.Text
        player:WaitForChild'leaderstats'.Description.Value = DE.Text
        end
end)
Players.PlayerAdded:connect(function(ply)
    local leaderstats = Instance.new'Folder'
    leaderstats.Parent = ply
    leaderstats.Name = 'leaderstats'
    local name = Instance.new'StringValue'
    name.Name = 'RPName'
    name.Value = ''
    name.Parent = leaderstats
    local Description = Instance.new'StringValue'
    Description.Name = 'Description'
    Description.Value = ''
    Description.Parent = leaderstats
end)

--Local Script
--\\ Services
local RS = game:GetService'ReplicatedStorage'
--\\ Nicknames
local RF = RS.RF
--\\ Main Code
script.Parent.MouseButton1Click:connect(function()
    local DE = game.Players.LocalPlayer.PlayerGui:WaitForChild'ScreenGui'.FrameBoxThing:WaitForChild'Description'
local Character = game.Players.LocalPlayer.PlayerGui:WaitForChild'ScreenGui'.FrameBoxThing:WaitForChild'Character'
    RF:FireServer(DE, Character)
end)

ServerScriptService.EventOccured:10: attempt to index local 'DE' (a nil value)