Lua "Class" problem

[awsdert]

I can "create" the class alright via this:

local dir = LakeDir(Lake.getcwd())
if not dir then error('Could not open our directory!') end
local ent = dir:next()
if not ent then error('No entries!') end
dir:shut()
dir = nil
ent = nil

With these as the backend

static int LakeDir_next( lua_State *L ) {
	LakeDir_t *d = (LakeDir_t*)lua_touserdata(L,1);
	if ( !d ) {
		puts("WTF!? We have no object!");
		lua_pushnil(L);
		return 1;
	}
	else if ( (d->ent = readdir(d->dir)) != NULL )
		return LakeDir__next( L, d );
	puts("readdir returned NULL!");
	lua_pushnil(L);
	return 1;
}
...
static int LakeDir( lua_State *L ) {
	const char *path = luaL_checkstring( L, 1 );
	LakeDir_t *d = (LakeDir_t*)lua_newuserdata(L, sizeof(LakeDir_t) );
	if ( !d ) {
		lua_pushnil(L);
		return 1;
	}
	memset( d, 0, sizeof(LakeDir_t) );
	luaL_getmetatable( L, LAKEDIR_META );
	lua_setmetatable( L, -2 );
	d->dir = opendir( path );
	if ( !d->dir ) {
		lua_pushnil(L);
		return 1;
	}
	lua_newtable(L);
	lua_pushstring( L, "next" );
	lua_pushcfunction( L, LakeDir_next );
	lua_settable( L, -3 );
	lua_pushstring( L, "shut" );
	lua_pushcfunction( L, LakeDir_gc );
	lua_settable( L, -3 );
    return 1;
}

Resulting in this output:

"O:\Common\Lake64\lake64" (in directory: O:\Data\C_Playground\cheat-engine-master\Cheat Engine)
Loading lua file...
WTF!? We have no object!
Failed to run makefile.lua
Fatal Lua Error!
makefile.lua:5: No entries!
stack traceback:
Compilation failed.

Since I still don't quite understand how to use the Lua "class" related c functions I need some help understanding how I got to the least expected result of no object at all

[awsdert]

Found a VERY helpful guide, 4. Making Your API Classy - Creating Solid APIs with Lua [Book] and am now using it to rectify C side errors such as no checking of the userdata (which flagged an error on the above script once I compiled and ran it)