attempt to index field '?' (a userdata value)

['LinKin]

Hello,

I've a small trouble.

local listMaps = exports.mapmanager:getMapsCompatibleWithGamemode(exports.mapmanager:getRunningGamemode() )

This is a complete list of the maps, in my case the gamemode is 'Race'.

I created a table, and in it, I will insert some maps; Like this:

local myTable = { }

for i, map in ipairs (listMaps) do

if getResourceInfo(map, "name") == mapName(*) then

// custom code...Puts the map in myTable.

end

end

So far works good.

But when I want to remove a map from my custom table, I use the following:

if getResourceInfo(myTable[1][1], "name") == mapSelected(*) then

// custom code

end

But the in-game debugger tells me this error:

ERROR: myscript\server.lua:145: attempt to index field '?' (a userdata value)

The line 145 is if getResourceInfo(myTable[1][1], "name") == mapSelected then

______________________________________________________________________________________________________________

(*): mapName & mapSelected are strings that I give (i.e [DD] Cross)

[Castillo]

That doesn't really make much sense to me, could you post your code? if you don't want others to take the code, send it over PM.

[glowdemon1]

Perhaps try https://wiki.multitheftauto.com/wiki/GetResourceName - but as solid said, it's kind of un-understandable atm.

['LinKin]

Solved.

I was treating 'myTable' as a vector, not a matrice. So by the time it was making this condition;

if getResourceInfo(myTable[1][1], "name") == mapSelected then

It was trying to access a position that did not exist. As a vector, when trying to access a position you gotta do it like this;

myTable[index]

That's why the error was similar to what Java says when you try accessing to a non-existing position;

ERROR: myscript\server.lua:145: attempt to index field '?' (a userdata value)

Thank you guys for the interest.

- Little mistakes that we commit

[Woovie]

Userdata is elements iirc. It may be other things too.

[myonlake]

Userdata is elements iirc. It may be other things too.

Lua provides a basic type specifically for this: userdata. A userdatum offers a raw memory area with no predefined operations in Lua.

I've experienced userdata when outputting an array, an element, some weird variables. It's just about everything miscellaneous as far as I can see. And like it says ".. with no predefined operations..", so it's pretty much like that.

But yeah, glad you got it fixed.