GameMaker Saving and Loading JSON

[NNNIKKI]

Whenever I startup my game, I get this error:
Data structure with index does not exist.
at gml_Script_load_game (line 21) - for (var a = 0; a < 36; a += 1 global.lc[a] = levelslist[? a];

That's funny, because in my save game code I have this:
var levelslist = ds_list_create();
for (var a = 0; a < 36; a += 1 ds_list_add(levelslist,global.lc[a]);
ds_map_add_list(mainmap,"Levels",levelslist);

And I know for a fact that it saves properly.
WHat's the problem? I'm not really experienced with JSON yet.

 

[NNNIKKI]

The smileys are supposed to be ; )

 

[Paskaler]

What I can spot is that levelslistis a ds_list and you are using the accessor meant for ds_maps in the error message:
levelslist[? a] should be levelslist[| a]

 

[NNNIKKI]

oh, i didn't know that
i copied it from a vid where he used ds_maps
Thanks for the help!