Sending a variable to a client using arguments?

I've tried to send a variable using arguments. From Server to Client then it should print variable. The problem is when the script is running,then it's just printing " nil ". But how can I fix this?

My serverside script

local Event = game.ReplicatedStorage.Printy
while true do
    wait(0.0555)
    local X = "hello"
    Event:FireAllClients(X)
end

Clientside:

local Event = game.ReplicatedStorage.Printy

Event.OnClientEvent:Connect(function(player,X)
print(X)
end)

It's always ending up printing " nil ".