MH Wilds) Edit a Monster Mesh then Crash to Desktop

[ansehdghks15]

first, excuse my english, cause im not living in the english region.

 

hi there, im trying to edit a somekind of monster.

so i opened the monster mesh, and import new mesh. 

 

1. i've done armature settings for new mesh.

2. i've done relation settings for new mesh.

3. rigging jobs finished.

4. i've done copy to paste material they needed.

5. and set the 'Linked Material' as  'RE MDF Material Settings' 

 

and exported the monster mesh, and game has run.

but the monster showed up, then crash to the desktop.

 

im struggle with the problem many time and i found cause.

 

the new mesh when i added, it is problem.

i delete them, then the crash symptoms is disappeared.

 

i think i did it sure right, but the result is not like that.

did i miss anything?