My config is really simple (this is my whole ItemAdders configuration) :
plugins/ItemsAdder/contents/custom/configs/blocks.yml
$$
info:
namespace: custom
items:
hexoriumore_block:
display_name: <gradient:#8F4936:#FF8261>"Minerai d'Hexorium"
resource:
generate: true
material: PAPER
textures:
- block/hexoriumore_block.png
- block/hexoriumore_block.png
- block/hexoriumore_block.png
- block/hexoriumore_block.png
- block/hexoriumore_block.png
- block/hexoriumore_block.png
specific_properties:
block:
placed_model:
type: REAL_NOTE
break_particles: BLOCK
rotx: 0
roty: 0
light_level: 2 #make block emit light
break_tools_whitelist:
- DIAMOND_PICKAXE
hardness: 5 #hardness of the block
no_explosion: false #totally immune from explosions, ignoring blast_resistance
sound: #customizable sounds of the block
break:
name: BLOCK_STONE_BREAK
volume: 1
pitch: 0.9
place:
name: BLOCK_STONE_BREAK
volume: 1
pitch: 0.9
$$
plugins/ItemsAdder/contents/custom/configs/items.yml
$$
info:
namespace: custom
items:
hexorium:
display_name: "Hexorium"
resource:
generate: true
material: DIAMOND
textures:
- item/hexorium.png
$$
plugins/ItemsAdder/contents/custom/configs/populators.yml (you have this file in the first message)
/version : This server is running Paper version git-Paper-496 (MC: 1.20.4) (Implementing API version 1.20.4-R0.1-SNAPSHOT) (Git: 7ac24a1 on ver/1.20.4)
/version lonelib : 1.0.54
/version protocolib : 5.2.1-SNAPSHOT-689
/version itemsAdder : 3.6.4-release-3