Indentation error? (Skript)

[MrSherloque]

Whenever i try to load my lifesteal plugin this error pops up
indentation error: expected 8 spaces, but found 12 spaces line 9 + 10

options:
    p: &8[&4Lifesteal&8]

command /resethearts [<number>]:
    aliases: /reseth
    permission: lifesteal.hearts
    permission message: "{@p}: &4You don't have permission for this command!"
    trigger:
            set player's max health to arg-1
            send "{@p} Succesfully resetted" to player