[Crash] How to properly make a unit use a projectile model?

[RobertMKD]

Hi, every time I give a unit the model of a projectile which I edited in a model editor, WE crashes once I select the model in the object manager.
The unit uses the model of the projectile with no problems if it's from the MPQ Archive, but when I import a projectile model and try to give it to a unit, the editor crashes.
What's funny is that I even tried to just import the same model as it is in MPQ Archive, without changing anything, and it crashed again.

So, how do I properly modify a projectile model and give it to a unit?

 

[Kaijyuu]

The problem is with the model. Something you did to it when you edited it in a model editor made the game crash.

 

[RobertMKD]

No, I already mentioned that I tried importing the model WITHOUT adding ANYTHING to it, and still it crashed the editor.