Attempt To Call A Nil Value?

I'm trying to make a ban button and it shows me this error, can anyone help me?

Here's my script

local banDataStore = game:GetService("DataStoreService"):GetDataStore("banDataStore")
local Frame = script.Parent.Parent





script.Parent.MouseButton1Click:Connect(function()
	local Player = Frame.Username.Text
	local PlayerUID = Player.UserId
	local success, errorMessage = pcall(function()
		banDataStore:SetAsync(PlayerUID, true)
	end)
	
	if not success then
		print("L")
	end
	
	Player:Kick("You've been banned from this game!")
	
	
end)

I assume that the Frame.Username is a TextBox, which would probably be causing the error.

You can't get the content of a TextBox in a server script, so you'd have to use RemoteEvents.

You are doing Player = Frame.Username.Text which is a string value, if you'd like to get the actual player you'd do

local Player = game.Players[Frame.Username.Text]

and it should work