NifSkope not recognizing .nif file

[Dylawa]

It is my first time making a mod, and the next step in making this mod is to import it to Nifskope. Whenever I do that, however, I only end up with this error code:

device position incorrect after block number 10 (NiTriShape) at 0x540 ended at 0x5a4 (expected 0x5a1)

and an empty nifskope workspace. The code for the item is present, but the object itself does not show up in the program. I read it may have something to do with skin partitions?

 

For reference, I made this item in blender, exported it as an obj, imported it to outfit studio, exported it as a nif, imported it into outfit studio again, gave it bone weights and texture, then exported as .nif. Am I missing a step? Do I need to do skin partitions?