On join doesn't work (Skript)

[ICoding_]

When i do "On join:" or "On first join:" it gives me an error...

Help me please!
[doublepost=1544951856,1544951823][/doublepost]error is:

[10:12:05 INFO]: [Skript] Reloading ranks+.sk...
[10:12:05 ERROR]: can't understand this event: 'on first join' (ranks+.sk, line 22: on first join:')
[10:12:05 INFO]: [Skript] Encountered 1 error while reloading ranks+.sk!
>sk reload ranks+
[10:12:17 INFO]: [Skript] Reloading ranks+.sk...
[10:12:17 ERROR]: can't understand this event: 'on join' (ranks+.sk, line 22: on join:')
[10:12:17 INFO]: [Skript] Encountered 1 error while reloading ranks+.sk!
[doublepost=1544952012][/doublepost]This is the code

#  
#                            W E L C O M E   T O  
#
#                                R A N K S +
#
#                    C R E A T E D   B Y :   I C O D I N G
#
#    (! Please don't edit the settings below unless you know what you are doing !)

options:
    #
    # Rank prefixes
    #
   
    default: &7
    developer: &a&lDEVELOPER &r&2
    mod: &3&lMOD &r&b
    admin: &4&lADMIN &r&c
    owner: &5&lOWNER &r&d
   
   
on first join:
    if folder "/plugins/Ranks+/Players" doesn't exist:
        create folder "/plugins/Ranks+/Players"
    if file "/plugins/Ranks+/Players/%uuid of player%.yml" doesn't exist:
        create file "/plugins/Ranks+/Players/%uuid of player%.yml"
        wait 1 tick
    wd "UUID:" to "/plugins/Ranks+/Players/%uuid of player%.yml"
    wd "Rank:" to "/plugins/Ranks+/Players/%uuid of player%.yml"
    wd "IsStaff:" to "/plugins/Ranks+/Players/%uuid of player%.yml"
    set {uuid::%player%} to yaml value "UUID" from file "/plugins/Ranks+/Players/%uuid of player%.yml"
    set {rank::%player%} to yaml value "Rank" from file "/plugins/Ranks+/Players/%uuid of player%.yml"
    set {isStaff::%player%} to yaml value "IsStaff" from file "/plugins/Ranks+/Players/%uuid of player%.yml"

[doublepost=1544955850][/doublepost]MY SKRIPT ISNT WORKING AS IT SHOULD!!!!
PLEASE HELP ME LIKE RIGHT NOW

 

[DieHollander_]

What version are you using?