i have a resourcepack with the folders, items, models, and textures.

The directory of the item is assets > solo leveling > models > item > demon_king_longsword.json
The directory of the item a second time for the modeling thing which I used blockbench is assets > solo leveling > items > demonkinglongsword.json
The directory of the texture is assets > solo leveling > textures > block > demon_king_longsword.png
The thing Im most confused about is when I try to /give myself a weapon with the item model, it just gives me an error with the purple and black box. Here is the code for the models > item one
{
  "parent": "solo_leveling:custom/demonkinglongsword",
  "textures": {
    "0": "solo_leveling:block/demon_king_longsword",
    "particle": "solo_leveling:item/af_accs_ts_02"
  }
}
The code for solo leveling > items is too long since its 3d
can someone please help?