[DaftMink]

It says it can't find the event.
The plugin code I'm using is here:

Spoiler

#include <sourcemod>
#include "include/Merx"

public OnPluginStart()
{
    HookEvent("entity_killed", OnEntityKilled);
}

public Action:OnEntityKilled(Handle:event, const String:name[], bool:dontBroadcast)
{
    new entity = GetEventInt(event, "entindex_killed");
    
    if (entity > 0 && IsValidEdict(entity))
    {
        decl String:classname[32];
        GetEdictClassname(entity, classname, sizeof(classname));
        
        if (strcmp(classname, "npc_grenade_frag") == 0 || (strcmp(classname, "npc_satchel") == 0 || (strcmp(classname, "npc_tripmine") == 0)))
        {
            return Plugin_Handled;
        }

        if (strncmp(classname, "npc_", 4, false) == 0)
        {
            new killer = GetEventInt(event, "entindex_attacker");
            if (killer > MaxClients || killer < 1)
            {
                return Plugin_Handled;
            }
            new Handle:customEvent = CreateCustomEvent("npc_death");
            SetCustomEventString(customEvent, "string_npcname", classname);
            SetCustomEventInt(customEvent, "int_attacker", killer);
            FireCustomEvent(customEvent);
            return Plugin_Handled;
        }
    }
    return Plugin_Handled;
}

and the event file is here:

Spoiler

"events"
{
    "player_death"
    {
        "format"            "You earned 2 points for killing %N."
        "formatkeys"
        {
            "userid"        "client"
        }
        "translated"        "0"
        "rewardtarget"        "attacker"
        "rewardifnotequals"    "userid"
        "rewardteam"        "0"
        "reward"            "5"
        "notifyall"            "0"
    }
    "npc_death"
    {
        "format"            "You earned 2 points for killing %s."
        "formatkeys"
        {
            "string_npcname"
        }
        "translated"        "0"
        "rewardtarget"        "int_attacker"
        "rewardteam"        "0"
        "reward"            "2"
        "notifyall"            "0"
    }
}