Runtime error when using worldedit.deserialize

[Ferk]

I'm attempting to make a mod (well, subgame) use ".we" files for its world generation. For this I'm using worldedit.deserialize directly from within my mod.

However, when I attempt to do this I obtain the following error:

Lua: Runtime error from mod 'default' in callback ScriptApiServer::on_chat_message(): 
   ...worldedit/serialization.lua:27: attempt to call method 'find' (a nil value)
   stack traceback:
   ...worldedit/serialization.lua:27: In function 'read_header'
   ...worldedit/serialization.lua:115: In function 'load_schematic'
   ...worldedit/serialization.lua:220: In function 'deserialize'

I'm actually not sure if this is really an issue that I should be posting here or is a mistake I made (I'm not very familiar with minetest development).

The schematic loads fine when I use the //load command from the console, and I'm basically using a very similar code to the one implemented in that command. It's just that I call it from a command implemented in my mod (the 'default' mod of my subgame).

What could be causing 'find' to be nil? Do I need to import some library or something?

[ShadowNinja]

If you're doing worldgen you should probably be using the Minetest schematic API (.mts schematics), since it's much faster than WorldEdit's API.

This error should only occur if you're not passing a string as deserialize's second argument (or you're doing something crazy, like deleting the string metatable).

[Ferk]

You were right.. I found out the problem, it's nothing related to worldedit, sorry. But thank you very much.

The reason why I'm not using .mts is that when using it I will lose data like the content of chests. The map I'm loading has chests and even some entities. I'm gonna have to find a different way to load the entities, but at least the chests are covered by worldedit.

Are there any plans for worldedit to support loading/saving entities? (...or maybe better: for minetest to have a way to save chest + entities).

Also, perhaps because the area is too big, I have errors when trying to load .mts schematic files: deSerializeBulkNodes: decompress resulted in invalid size (do you think I should open an issue in minetest for that?), I just wrote very simple save/load commands and consistently the game crashes with that error when performing //msave and then //mload

minetest.register_chatcommand("/msave", {
    params = "",
    description = "Saves the map",
    privs = {worldedit=true},
    func = function(name, param)
        minetest.create_schematic({x=0,y=-30,z=11}, {x=111,y=30,z=155}, nil, minetest.get_modpath("default").."/map.mts");
    end
});

minetest.register_chatcommand("/mload", {
    params = "",
    description = "Load the map",
    privs = {worldedit=true},
    func = function(name, param)
        minetest.place_schematic({x=0, y=-30, z=11}, minetest.get_modpath("default").."/map.mts");
  end
});

[ShadowNinja]

@Ferk: No plans for entity saving, but that could be added as an option. It seems like your schematic is being corrupted somehow, you might want to ask about it in #minetest-dev.