Core Academy: Core Certification (Part IV) - Scripting and Core API...Spawn Objects

Help
1

I have students that are trying to work on "Core Certification" in Core Academy and we have run into an issue that we can't seem to fix (more than 4 weeks working on this...) . We are using the provided code to spawn and equip a hat but we just get an error (listed below). Provided below will be the link...the error code...the ShopServer code...and the UIShop (in case it is a part of the problem. As an FYI, I have used both "Hat" and "WizardHat" in the custom properties and neither of them work.

Here is the link for the exact page in Core Academy

Error running Lua task: [6C2795901343C52B] ShopServer:4: stack index 1, expected string, received nil: (bad argument into 'CoreObject(string, table)')

Here is the code from the ShopServer:
local HAT = script:GetCustomProperty("WizardHat")

function SpawnAndEquip(player, ref)
local equipment = World.SpawnAsset(ref)
equipment:Equip(player)
end

function OnBuyHat(player)
if player:GetResource("Coins") < 3 then
print("Error, not enough coins")
return
end
player:RemoveResource("Coins", 3)
SpawnAndEquip(player, HAT_REF)
Events.BroadcastToPlayer(player, "ToggleShop", false)
end

Events.ConnectForPlayer("BuyHat", OnBuyHat)

Here is the UIShop code:
local BUYHAT_BUTTON = script:GetCustomProperty("BuyHatButton"):WaitForObject()
local UI_CONTAINER = script:GetCustomProperty("UI Container"):WaitForObject()

-- Hide the container when starting the game
UI_CONTAINER.visibility = Visibility.FORCE_OFF

local HAT_PRICE = 3

local PLAYER = Game.GetLocalPlayer()

function OnBuyHat(button)
if PLAYER:GetResource("Coins") < HAT_PRICE then
print("Not enough coins")
return
end
Events.BroadcastToServer("BuyHat")

print("Just bought a hat")
-- Here we need to send the information to the server
-- Only the server can remove resources and spawn the equipment

end
BUYHAT_BUTTON.clickedEvent:Connect(OnBuyHat)

-- This function show and hide the UI
-- Triggered when another script send the "ToggleShop" event
function ToggleUI(show)
if show then
UI_CONTAINER.visibility = Visibility.INHERIT
else
UI_CONTAINER.visibility = Visibility.FORCE_OFF
end

-- Here, we are using show as this value equals true or false
UI.SetCursorVisible(show)
UI.SetCanCursorInteractWithUI(show)

end
Events.Connect("ToggleShop", ToggleUI)

2

The error is due to the HAT variable highlighted below:

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image721×393 17.6 KB

Just rename one of them so that they both match up and that should fix the error.

local HAT_REF = script:GetCustomProperty("WizardHat")

function SpawnAndEquip(player, ref)
    local equipment = World.SpawnAsset(ref)
    equipment:Equip(player)
end

function OnBuyHat(player)
    if player:GetResource("Coins") < 3 then
        print("Error, not enough coins")
        return
    end
    player:RemoveResource("Coins", 3)
    SpawnAndEquip(player, HAT_REF)
    Events.BroadcastToPlayer(player, "ToggleShop", false)
end

Events.ConnectForPlayer("BuyHat", OnBuyHat)
3

--the things I will do for my students...-- Thanks for that...but...now it is telling me that (line 5) "equipment:Equip(player)" isn't working.

I am starting again on learning to code but that doesn't mean I am learning fast enough to come up with answers that are likely sitting there slapping me in the face and I don't even know it. Is it wanting me to reference the direct name of the character? in this case I am using the Humanoid 2 Rig...but if I reference a character directly wouldn't this make the use of any other character unusable...?

local HAT_REF = script:GetCustomProperty("WizardHat")

function SpawnAndEquip(player, ref)
local equipment = World.SpawnAsset(ref)
equipment:Equip(player)
end

function OnBuyHat(player)
if player:GetResource("Coins") < 3 then
print("Error, not enough coins")
return
end
player:RemoveResource("Coins", 3)
SpawnAndEquip(player, HAT_REF)
Events.BroadcastToPlayer(player, "ToggleShop", false)
end

Events.ConnectForPlayer("BuyHat", OnBuyHat)

4

HI, richardkaer

did you finally found the ussie in your script ?

i have the exactly same issue here

Error running Lua task: [75C1510D8C9E7B2B] ShopServer:5: attempt to call a nil value (method 'Equip')

My script for Shop Server:

local HAT_REF = script:GetCustomProperty("Hat")

function SpawnAndEquip(player, ref)
local Equipment = World.SpawnAsset(ref)
Equipment:Equip(player)
end

function OnBuyHat(player)
if player:GetResource("Coins") < 3 then
print("Error, not enough coins")
return
end
player:RemoveResource("Coins", 3)
SpawnAndEquip(player, HAT_REF)
Events.BroadcastToPlayer(player, "ToggleShop", false)
end

Events.ConnectForPlayer("BuyHat", OnBuyHat)

and UIShop:

-- Custom
local BUY_HAT_BUTTON = script:GetCustomProperty("BuyHatButton"):WaitForObject()
local UI_CONTAINER = script:GetCustomProperty("UI Container"):WaitForObject()

-- Hide the container when starting the game
UI_CONTAINER.visibility = Visibility.FORCE_OFF

local HAT_PRICE = 3

local PLAYER = Game.GetLocalPlayer()

function OnBuyHat(button)
if PLAYER:GetResource("Coins") < HAT_PRICE then
print("Not enough coins")
return
end
Events.BroadcastToServer("BuyHat")
end
-- Here we need to send the information to the server
-- Only the server can remove resources and spawn the equipment
UIShop
BUY_HAT_BUTTON.clickedEvent:Connect(OnBuyHat)

-- This function show and hide the UI
-- Triggered when another script send the "ToggleShop" event
function ToggleUI(show)
if show then
UI_CONTAINER.visibility = Visibility.INHERIT
else
UI_CONTAINER.visibility = Visibility.FORCE_OFF
end

-- Here, we are using show as this value equals true or false
UI.SetCursorVisible(show)
UI.SetCanCursorInteractWithUI(show)

end
Events.Connect("ToggleShop", ToggleUI)

6

I haven't...the new error dealing with the player is: equipment:Equip(player). I was thinking that it is having issues with needing to have a local identifier (may be the wrong terminology) for the player but we haven't found anything yet.

7

Mine is working....on the spawn object page go slowly and watch where you are placing the code. There was a vague reference that I think I missed previously. It is very vague (or I saw it that way and I am perfect so...).

8

Here is the "game" so you can open it up and compare the code. I will need to do the same to see what the students have been doing wrong. Core Certification Part IV by richardkaer - Core Games