The collection could not be unloaded since it was never loaded (SOLVED)

Bugs
1

I am developing a game that have 4 collections: menu, credit, game and game over collection. I follow the tutorial but it have only 2 scenes that call each other. In my case, I have 3 scenes
In the menu scene I have 2 options in the gui start and credit. In the game over scene I have restart and menu option. When I click credit in menu, it will load the credit scene but when I click back to menu I see this error

ERROR:GAMESYS: The collection /scenes/game_over/game_over.collectionc could not be unloaded since it was never loaded. Message ā€˜unloadā€™ sent from controller:/loader_controller#controller to controller:/loader_controller#game_over_proxy.

I see the same error when I click menu in game over scene

ERROR:GAMESYS: The collection /scenes/credit/credit.collectionc could not be unloaded since it was never loaded. Message ā€˜unloadā€™ sent from controller:/loader_controller#controller to controller:/loader_controller#credit_proxy.

This is my code

if message_id == hash(ā€œshow_menuā€) then
msg.post(ā€œ#menu_proxyā€, ā€œloadā€)
msg.post(ā€œ#game_over_proxyā€, ā€œunloadā€)
msg.post(ā€œ#credit_proxyā€, ā€œunloadā€)
end

2 
msg.post("#game_over_proxy", ā€œunloadā€)
msg.post("#credit_proxy", ā€œunloadā€)

These two lines will be throwing an error if you havenā€™t loaded these collections using the ā€œloadā€ message.

I suggest you keep some state variable to keep track of what collections you have actually loaded.

3

When I receive the proxy_loaded message, I can save the sender to a local variable and call it to unload when I load the new collection, right?

4

Yes, exactly, but remember that that ā€œlocalā€ must be in the scope where you are trying to use it ofc.

5

Hereā€™s another example of loading and unloading screens with a controller script that tracks the state:

6

@britzl I follow your example but my collection refer to 2 other collections and it causes the error above.

7

Yes, but as Matthias points out, you unload two collections, credits and game. Are both loaded? If not, then unload just the one that is loaded.

1 Like
8

@britzl Both credit and game over collection refer to menu collection. If I am back to menu from credit, it will unload credit but game over has not been loaded yet. Vice versa for game over collection. And @Mathias_Westerdahl solution worked well. Thank you guys

1 Like
9

Quick question. Is it a serious problem to try to unload a collection which is already unloaded? Imagine Thereā€™s a lazy developer who does something like this

		msg.post("#levelselect", "unload")
		msg.post("#levelselect", "load")

Just to make sure that the level select screen is always unloaded. An error is thrown to the console, but what implications are there?

10

None. Youā€™re wasting some CPU cycles but thatā€™s it.