I followed the instructions adding custom mobs still error?

[Hafflex]

Modified the following:

*Client side

-which folder should I place these files? I have (luafiles) and (luafiles514)

-jobname.lub

-npcidentity.lub

*Sprite

-added my custom mob @ /npc

*database

-constants.conf

-pre-re/mob_db.conf

My custom mob id is 2998

I notice that there are some difficulties when doing it with the latest hercules.

Are there any additional file that I need to touch?

 

[Ehwaz]

What errors ?

 

[Hafflex]

Could be sprite error, because after logging in, the error occurs. 

Prior logging in, I tried to spawn the custom monster then suddenly my client logged off automatically.