Creation Kit crashes when loading armour mesh

[livipup]

So I'm trying to help somebody make a mod that adds a helmet to the game and I went through all of the trouble of converting the FXB files they provided to NIF files and I built the game data to a point where I just need to change the textures and meshes of the objects, but whenever I try to change the mesh the CK crashes. I'm assuming the problem is something wrong with the mesh, but I searched around and haven't been able to find a solution. The only things I can think of is that I either messed something up in NifSkope, or the problem lies in the fact that the mesh contained multiple separate parts in one file. I don't know what to do here. I'm going to attach the nif so if you want to help you can check it out yourself.

[Genamine]

Try this, your original NIF was missing skin instances, but did have skin bone data

Skin bone data is supposed to be a child of a skin instance

Im assuming that is what caused the crash

 

It also had a connect point that appeared to be there for no reason, that is also removed in the NIF I attached