I need some help with Entity Spawning on a location from Derma Panel

[TheBOOMStick]

Hello,

We have been trying to make a entity (a computer) and when you press e on it, it opens a derma screen with a button. When clicking the button it should spawn a vehicle (in this case a Tie Fighter from starwars).
When we put this in our server for testing the derma does not open. Could anyone help us by saying what we have done wrong here?

concommand.Add( "vehiclecomputer", function( ply, cmd, args )
local q = 650
local w = 200
local ply = LocalPlayer()
local mey = LocalPlayer()
local ich = LocalPlayer()


local main = vgui.Create( "DFrame" )
main:SetPos( q, w )
main:SetSize( 600,600 )  -- main:SetSize( ScrW() * 0.3125, ScrH() * 0.5555 )
main:Center()
main:SetTitle( " " )
main:SetVisible( true )
main:SetDraggable( false )
main:ShowCloseButton( true )
main.Paint = function()
draw.RoundedBox( 0, 0, 0, main:GetWide(), main:GetTall()-570, Color( 30, 30, 30, 254) )
draw.RoundedBox( 0, 0, 27, main:GetWide(), main:GetTall()-597, Color( 80, 80, 80, 230) )
draw.RoundedBox( 0, 0, 30, main:GetWide(), main:GetTall(), Color( 45, 45, 45, 220) )
draw.RoundedBox( 0, 0, 140, main:GetWide(), main:GetTall()-532, Color( 30, 30, 30, 254) )
end
main:MakePopup()	
    
    
    
    
local close = vgui.Create ( "DButton" , main)
close:SetSize( 600,30 )
close:SetPos(0,570) --,385
close:SetTextColor( Color( 255, 255, 255, 255 ) )
close:SetText("Click here to spawn a Tie Fighter")
close.Paint = function()
draw.RoundedBox( 0, 0, 0, close:GetWide(), close:GetTall(), Color( 0, 160, 17, 220) )
end
close.DoClick = function()	
    chat.AddText( Color( 175, 0, 0 ), "[Vehicle System]: ",Color( 100, 100, 255 ), ply:GetName(),Color(127, 176, 255), ", you have spawned a Tie Fighter" )
	ply:EmitSound( Sound( "buttons/button9.wav" ), Entity( 1 ):GetPos(), 1, CHAN_AUTO, 1, 75, 0, 100 )

      
  function ENT:SpawnFunction( ply, tr, tie_fighterMODEL )
        
  local pos = ply:GetPos()  

	local ent = ents.Create( tie_fighterMODEL )
 	ent:SetPos (Vector (pos + Vector(10,0,5)))
	ent:Spawn()
	ent:Activate()

	return ent

end
	main:Remove()		
end