Creating a work with seed using Multiverse-Core

[Instanity]

Please help! Im trying to solve this for ages!!!!

on skript start:
    set {uhc::game::started} to false
    wait a minute
    execute console command "/mv delete uhc_world"
    wait 10 ticks
    execute console command "/mvconfirm"
    set {uhc::game::world} to a random integer between 1 and 6
on skript start:
    if {uhc::game::world} is not set:
        set {uhc::game::world} to a random integer between 1 and 6
        wait a tick
        broadcast "%{uhc::game::world}%"
        wait 140 seconds
        if {uhc::game::world} is 1:
            execute console command "/mv create uhc_world normal -s -6505837170832228537"
        if {uhc::game::world} is 2:
            execute console command "/mv create uhc_world normal -s 932475610972574098"
        if {uhc::game::world} is 3:
            execute console command "/mv create uhc_world normal -s -4705034784483231674"
        if {uhc::game::world} is 4:
            execute console command "/mv create uhc_world normal -s -5832038334522793048"
        if {uhc::game::world} is 5:
            execute console command "/mv create uhc_world normal -s 4155519082845793722"
        if {uhc::game::world} is 6:
            execute console command "/mv create uhc_world normal -s -670278141449929333"
        broadcast "&4UHC&8» &7Creation of the UHC world has started"

Thanks for your time!!!!!