It's used in several places, just picked up one randomly. Here ServerActivate, it contains a reference to AddEntityHashValue and a string "Can't instance %s\n".
Code:
if (pClass && !(pClass->pev->flags & FL_DORMANT))
{
AddEntityHashValue(&pEdictList[i].v, STRING(pEdictList[i].v.classname), CLASSNAME);
pClass->Activate();
}
else
ALERT(at_console, "Can't instance %s\n", STRING(pEdictList[i].v.classname));
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