FireClient can only be called from the server?

Hello everyone i am trying to make so that when you press a button it passes a parameter of the player and the button to another script. It's working in studio altough not when playing on a server ingame. I don't know what i have done wrong. The error i get from the command console is:

"FireClient can only be called from the server".

Local Script that passes the arguments and triggers the event:

script.Parent.MouseButton1Click:connect(function(plr)
    game.Workspace.Shop_Script.RemoteEvent:FireClient(plr,script.Parent, script.Parent.Parent.Parent.Parent.Parent.Parent)
end)

my event:

script.RemoteEvent.OnClientEvent:connect(function(par, plr)
--My code
end)

Anyone know what i have done wrong?

Help would be really appreciated, thanks!