Creation Kit Crashing After Uploading a New Mesh for a Weapon

[StormKat33]

Got a problem. I used a technique on Youtube. I got this from the Oblivion Nifskope tutorial, it is about combining Meshes.

 

I did this on the Skyrim Nifskope to a new weapon from combining two weapons and uploaded it to the Skyrim Creation Kit. When that happened, during the Mesh upload the Creation Kit stopped working.

 

Do you all know why this has happened?

 

I've looked this topic all over the place and can't find one.

 

Thanks