Hello, i tried using your mod on aternos , i modified the config file
[minecraft:netherite_sword]
#Sets the efficiency. Does not work for swords and tridents.
efficiency = []
#Sets the attack damage.
attack_damage = [14]
#Sets the attack speed.
attack_speed = [1.7]
#Sets the tool harvest level. Does not work for swords and tridents.
harvest_level = []
And it keep crashing my serv , could you explain how to use the mod

What you were doing is wrong. It would be best to join the discord (https://discord.gg/GM6XSqM), which is where I prefer giving support - GitHub should be used for bugs only.