Importing Von Leon v83 - Failed To Load. (Null)

[CloudNine]

I've read up past threads, imported mob.wz, sound.wz, UI.wz (boss HP) and string.wz but still doesn't allow me to spawn in-game, I've imported other mobs without any issue only von leon faces this error.

What I've done -
Mob.wz - Imported boss itself (8840000 and 8840010)
Sound.wz - Imported mob.img > 8840000
UI.wz -> Imported mobgage
String.wz -> Imported mob name/IDs

Can someone guide me through this

[MentaL_BOT]

[Blu3sky]

If you are importing the 8840000 xml file from a higher maple version, you will need to create additional MDDamage and PDDamage fields in the info section.Then dump and try to spawn again in the game