title: Roblox - attempt to call a nil value
body: <p>When trying to create a code, that on FireServer with Specific Player chosen a GUI would've been cloned into their PlayerGui, But instead I get a nil value.</p>
  <p>Code:</p>
  <pre><code>local Blinder = game.ReplicatedStorage.RCD.Blind
  
  
  Blinder.OnServerEvent:Connect(function(player, PlayerToBlind)
      if not player:IsInGroup(7465879) then return false end;
      script.BL:Clone().Parent = PlayerToBlind:WaitForChild(&quot;PlayerGui&quot;)
      print(&quot;Done&quot;)
  end)
  </code></pre>
  <p>Basically what I  try to reach is if my Admin Panel Remoteevent is fired, and a Target has been chosen, the Targeted Player will become a Cloned GUI into their PlayerGui</p>
  <p>Any fix on this error?</p>