Remote Event not working? Works in studio but not game

I made an object with a server script inside, a remote event inside player character scripts, and a remote event inside replicated Storage. The thing works inside studio, but In-game it says Fireclient argument must be a player object. Any ideas? Thank you. this is server script

--Declare
--GameServices
local plr = game:GetService("Players").LocalPlayer
local Workspace = game:GetService("Workspace")
local repSto = game:GetService("ReplicatedStorage")

--Items
local fooPic = script.Parent
local AddValueEvent = repSto:WaitForChild("FoodPickupEvent")

--Process
local function FireServerWhenTouched (hit, plr)
    if hit.Parent:FindFirstChild("Humanoid") then
        fooPic:Destroy()
        AddValueEvent:FireClient(plr)
    end
end
--Conect
fooPic.Touched:Connect(FireServerWhenTouched)


--------------------------------------------------
this is local script inside player

--Declar
--GameServices
local player = game:GetService("Players").LocalPlayer
local pgui = player:WaitForChild("PlayerGui")
local repStore = game:GetService("ReplicatedStorage")

--RemoteEvent
local AddValueEvent = repStore:WaitForChild("FoodPickupEvent")

--PLayerGui
local sg = pgui:WaitForChild("ScreenGui")
local is = sg:WaitForChild("InStats")
local foodAmm = is:WaitForChild("FoodAmm")

local bp = player:WaitForChild("Backpack")
local isf = bp:WaitForChild("InvStats")
local accAmm = isf:WaitForChild("FoodAmm")

--Process
local function ChangeMessageWhenFired()
    accAmm.Value = (accAmm.Value + 1)
    foodAmm.Text = accAmm.Value
end

--Connect
AddValueEvent.OnClientEvent:Connect(ChangeMessageWhenFired)

thank you