Unable To Cast Value To An InvokeClient ?

This is in a part and its sending this information to a localscript in a player Idk why it doesnt Work

-- Inside The part
AlreadyClicked = false
script.Parent.PlayerName.Changed:connect(function()										
                    if AlreadyClicked == false then
					AlreadyClicked = true
					local PlayerName = script.Parent.PlayerName.Value
					local Player = script.Parent.PlayerName.Value
					local Level = script.Parent.Level.Value
					local DescLine = script.Parent.DescLine.Value
					local NameLine = script.Parent.NameLine.Value
					local IsSword = script.Parent.IsSword.Value
					local IsHelmet = script.Parent.IsHelmet.Value
					local IsLegging = script.Parent.IsLegging.Value
					local IsChestPlate = script.Parent.IsChestPlate.Value
					local ImageId = script.Parent.ImageID.Value
						local success, result = pcall(function() return game.Players[PlayerName].PlayerGui.LocalWriter.OnLoot:InvokeClient(Player, Level, DescLine, NameLine, IsSword, IsHelmet, IsLegging, IsChestPlate, ImageId) end)
						print(result)
	                    if success then
		                if result ~= "Full" then
			            script.Parent:Destroy()
		                elseif result == "Full" then
			            AlreadyClicked = false
		                end
	                    else
		                print("Can't Write Inventory")
	                    end
	                    end				
		end)

-- Inside The LocalScript
EmptySlot = nil
function script.OnLoot.OnClientInvoke(Player, Level, DescLine, NameLine, IsSword, IsHelmet, IsLegging, IsChestPlate, ImageId)
local SlotLocation = script.Parent.Backpack.Slots
local FullInv = script.Parent.Backpack.Open
					if SlotLocation.Slot1.Found.Value==false then
						EmptySlot="Slot1"
					elseif SlotLocation.Slot2.Found.Value==false then
						EmptySlot="Slot2"
					elseif SlotLocation.Slot3.Found.Value==false then
						EmptySlot="Slot3"
					elseif SlotLocation.Slot4.Found.Value==false then
						EmptySlot="Slot4"
					elseif SlotLocation.Slot5.Found.Value==false then
						EmptySlot="Slot5"
					elseif SlotLocation.Slot6.Found.Value==false then
						EmptySlot="Slot6"
					elseif SlotLocation.Slot7.Found.Value==false then
						EmptySlot="Slot7"
					elseif SlotLocation.Slot8.Found.Value==false then
						EmptySlot="Slot8"	
					elseif SlotLocation.Slot9.Found.Value==false then
						EmptySlot="Slot9"
					elseif SlotLocation.Slot10.Found.Value==false then
						EmptySlot="Slot10"
					elseif SlotLocation.Slot11.Found.Value==false then
						EmptySlot="Slot11"
					elseif SlotLocation.Slot12.Found.Value==false then
						EmptySlot="Slot12"
					elseif SlotLocation.Slot13.Found.Value==false then
						EmptySlot="Slot13"
					elseif SlotLocation.Slot14.Found.Value==false then
						EmptySlot="Slot14"
					elseif SlotLocation.Slot15.Found.Value==false then
						EmptySlot="Slot15"
					elseif SlotLocation.Slot16.Found.Value==false then
						EmptySlot="Slot16"	
					else
						EmptySlot="Full"
						FullInv.Full.Visible = true
						wait(4)
						FullInv.Full.Visible = false
						return "Full"										
					end
					if EmptySlot~="Full" then								
						game.Workspace.Function.InventoryWriter.Loot:InvokeServer(EmptySlot, NameLine)			
						SlotLocation:FindFirstChild(EmptySlot).Image.Image= ImageId
						SlotLocation:FindFirstChild(EmptySlot).Image.ItemName.Value = NameLine
						SlotLocation:FindFirstChild(EmptySlot).Image.IsSword.Value = IsSword
						SlotLocation:FindFirstChild(EmptySlot).Image.IsChestPlate.Value = IsChestPlate
						SlotLocation:FindFirstChild(EmptySlot).Image.IsHelmet.Value = IsHelmet
						SlotLocation:FindFirstChild(EmptySlot).Image.IsLegging.Value = IsLegging
						SlotLocation:FindFirstChild(EmptySlot).Image.ItemDesc.Value = DescLine
						SlotLocation:FindFirstChild(EmptySlot).Image.ImageID.Value = ImageId
						SlotLocation:FindFirstChild(EmptySlot).Image.Level.Value = Level						
						SlotLocation:FindFirstChild(EmptySlot).Found.Value=true
                        game.Workspace.SaveServices.Save:InvokeServer()			
						return "Sucess"
					end
end

• I forget to mention the Error Is: Unable to cast value to object