FireClient: Player Argument Not Player Object?

Hello, I haven't continued my work cause of stupid bugs. I have made a script for an admin panel which can be activated with a card. btw its a FEI: Filtering Enabled Issue.

Script:

local event = game.ReplicatedStorage:WaitForChild("AdminEvent")
script.Parent.Touched:Connect(function(card)
    local parent = script.Parent.Parent.Parent.Admin
    if card.Name == "Admin Card" then
        script.Parent.Parent.LED.BrickColor = BrickColor.new("Bright green")
        script.Parent.Beep:Play()
        wait(0.5)
        script.Parent.Parent.LED.BrickColor = BrickColor.new("Really black")
        script.Parent.Parent.Parent.PlayerName.Value = card.Parent.Parent.Parent.Name
        event:FireClient(player,card,parent) --The Problem
    end
end)

Local Script:

local event = game.ReplicatedStorage:WaitForChild("AdminEvent")
event.OnClientEvent:Connect(function(card, parent)
        parent.Enabled = true
end)

Edit Script or Explain solution :)