Issues with Nif not importing

[Sootyjared2]

I cannot import a nif file to nifskope, i get an error code

 

"failed to load block number 6 (NiTriShapeData) previous block was BSShaderTextureSet

Failed to load D:/SteamLibrary/steamapps/common/Fallout 3 goty/Data/meshes/weapons/2handrifle/railwayrifle.nif"

 

Is there any fix to this issue, i have no idea what is causing it and have no clue on how to fix it. This is the first time of me doing something like this.

 

I used blender to edit the model.