The wrong message given by kldload

I compile a module, and use kldload command to load the module, but kldload says: "can't load ./xxx.ko: No such file or directory". It is weird.

What's wrong? The module is there, kldload can't see it?

I constructed a module and declared sysctl varible. If I use SYSCTL_DECL instead of SYSCTL_NODE, kldload will print that message.
In this case, the parent node -- ss is not exist, the sysctl variable can't be registered, so kldload gets ENOENT from the inner functions.

The inner functions should return other errno except ENOENT.  ENOENT will confuse the programmer.
#include
#include
#include
#include
#include
#include
#include
static int
xxx_modevent(module_t mod, int type, void *unused)
{
switch (type) {
  case MOD_LOAD:
   printf("is here\n");
   break;
  case MOD_UNLOAD:
   break;
  default:
   return EINVAL;
}
return 0;
}
static moduledata_t xxx_mod = {
"xxx",
xxx_modevent,
0
};
DECLARE_MODULE(xxx, xxx_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
MODULE_VERSION(xxx, 1);
SYSCTL_NODE(, OID_AUTO, ss, CTLFLAG_RW, 0, "SS");
/* wrong ..
* SYSCTL_DECL(_ss);
*/
SYSCTL_NODE(_ss, OID_AUTO, son, CTLFLAG_RW, 0, "SON");
static u_long leaf = 0;
SYSCTL_ULONG(_ss_son, OID_AUTO, leaf, CTLFLAG_RD, &leaf, 0, "");


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