Using the mc plugin language to fix import errors

Question

I am new to programming minecraft plugins, so I hired someone to create a skript for me. Apparently the code managed to have errors & I couldn't understand it after even diagnosing the problem by installing a completely seperate thing that the person I hired recommended. Here is the error I have been getting:

[Server thread/ERROR]: [Skript] ?c?lLine 1:?7 (x.sk)
?c    Can't understand this event: 'import'
?6    Line: ?7import:
 ?r
[16:30:26] [Server thread/ERROR]: [Skript] ?c?lLine 10:?7 (x.sk)
?c    Can't understand this event: 'on PlayerAchievementAwardedEvent'
?6    Line: ?7on PlayerAchievementAwardedEvent:
 ?r
[16:30:26] [Server thread/ERROR]: [Skript] ?c?lLine 53:?7 (x.sk)
?c    Can't compare a player with an integer
?6    Line: ?7if arg-1 is not 1:
 ?r
[16:30:26] [Server thread/ERROR]: [Skript] ?c?lLine 57:?7 (x.sk)
?c    'else' has to be placed just after another 'if' or 'else if' section
?6    Line: ?7else:
 ?r

And this is the code I have been given:

import:
    "org.bukkit.event.player.PlayerAchievementAwardedEvent"

on load:
    load yaml "plugins\XAchievement\data\achievementsdata.yml" as "data"
    
on unload:
    unload "data"

on PlayerAchievementAwardedEvent:
    if yaml value "data.%event.getPlayer()%.max" from "data" doesn't exist:
        set yaml value "data.%event.getPlayer()%.max" from "data" to 1
        set {_x} to 1 / 90 + 0.20
        set the event.getPlayer()'s walk speed to {_x}
    else:
        set {_x} to yaml value "data.%event.getPlayer()%.max" from "data"
        set yaml value "data.%event.getPlayer()%.max" from "data" to {_x} + 1
        set {_x} to {_x} + 1 / 90 + 0.20
        set the event.getPlayer()'s walk speed to {_x}
    save yaml "data"
    send "&aYou gained an advancement and your speed has increased." to event.getPlayer()
    
command /speedsettings [<integer>]:
    trigger:
        if arg-1 is set:
            if yaml value "data.%player%.max" from "data" exists:
                set {_x} to yaml value "data.%player%.max" from "data"
                if {_x} is greater than or equal to arg-1:
                    if arg-1 is not 1:
                        set {_y} to arg 1 / 90 + 0.20
                        set the player's walk speed to {_y}
                        send "&aYour speed is set to &e%arg-1%"
                    else:
                        set the player's walk speed to 0.20
                        send "&aYour speed is set to &e%arg-1%"

                else:
                    send "&cMaximum speed: &6%{_x}%"
            else:
                send "&cYou can't speed up, your level is 1"
        else:
            send "&cSpeed error!"
            
command /setspeed [<player>] [<integer>]:
    permission: skript.setspeed
    permission message: &cDoesn't have permission!
    trigger:
        if arg-1 is set:
            if arg-2 is set:
                if yaml value "data.%arg-1%.max" from "data" exists:
                    set {_x} to yaml value "data.%arg-1%.max" from "data"
                    if {_x} is greater than or equal to arg-1:
                        if arg-1 is not 1:
                            set {_y} to arg 1 / 90 + 0.20
                            set the player's walk speed to {_y}
                            send "&aThe speed of the &e%arg-1% &ais set to &e%arg-2%&a."
                        else:
                            set the player's walk speed to 0.20
                            send "&aThe speed of the &e%arg-1% &ais set to &e%arg-2%&a."

                    else:
                        send "&cMaximum speed: &6%{_x}%"
                else:
                    send "&cYou can't speed up, &6%arg-1%'s &clevel is 1"
            else:
                send "&cSpeed error!"           
        else:
            send "&cPlayer error!"      

If anyone can help me, thanks!