YML list checking.

[Barbarx]

Hello. i created one skript but i cant check if %entity uuid of victim% is in yml list.

on load:
    if file "plugins/Skript/MoboveSpawner.yml" doesn't exists:
        create file "plugins/Skript/MoboveSpawner.yml"
        add "Vytvoreno" to yml list "Mobove" of file "plugins/Skript/MoboveSpawner.yml"
on spawn:
    if "%spawn reason%" is "SPAWNER":
        add "%entity uuid of entity%" to yml list "Mobove" of file "plugins/Skript/MoboveSpawner.yml"
on death:
    victim is not player
    if yml list "Mobove" from file "plugins/Skript/MoboveSpawner.yml" contains "%entity uuid of victim%":
        remove "%entity uuid of victim%" from yml list "Mobove" of file "plugins/Skript/MoboveSpawner.yml"
on unload:
    delete file "plugins/Skript/MoboveSpawner.yml"

Without errors. only i cant check
so my problem is here:

if yml list "Mobove" from file "plugins/Skript/MoboveSpawner.yml" contains "%entity uuid of victim%":

And sorry for my bad english.