Lang file is glitchy. Copy and paste this into lang.yml to solve it:
Weapons-master:Weapons MasterRanger:RangerMage:MagePyro:PyroJuggernaut:JuggernautBeastmaster:Beast MasterArbalist:Arbalistskill-selection-message:'Youarenowa'skill-does-not-exist:'Thatskilldoesn''texist!Validskills:weaponsmaster,ranger,mage,pyro,juggernaut,beastmaster,arbalist'skill-owned-error:You already have a skill!no-perm-error:You have no permission to use this command!cooldown-error:You need %cooldown% before changing your skill againno-skill-error:You don't have a skill type! Choose one with /skill selectyou-are-a-level:'Youarealevel'console-error:'ERROR:Onlyplayerscanuse/skill'cmd-descriptions:select:Choose a skill, if you don't have onechange:Allows you to change your skill, but has a cooldowninfo:Shows information about one skill typeequip:Allows you to equip your forged weaponryequipment:Free equipment items.list:List of all skill typesimprove:Allows you to spend souls to learn skillslevel:Shows your skill level and soul amount, if you have a skill typesee:Shows you information of a playersetskill:Force change your skillcmd-usage:info:'Usage:/skillinfo[skillname]'setskill:'Usage:/skillsetskill[skillname]'desc:weaponsmaster-desc:Weapons Masters are ruthless and skillful, effectively decimating all that dares to challenge him. Attacks deal bonus damage.weaponsmaster-strong:Each level you earn increases the bonus damageweaponsmaster-weak:Weapons Masters don't fare well against fire.ranger-desc:A Ranger's sprint is incomparable by any other class. Melee attacks poison your target.ranger-strong:Each level you earn increases poison duration.ranger-weak:Rangers take more damage from the environment.mage-desc:Mages are strong in the art of magic and dispatch their enemies with a nice shiny staff. When fighting with hoes deal bonus damage and and heal for an amount.mage-strong:Each level you earn increases the bonus damage and every 5 levels increase the healmage-weak:Mages deal less damage when armed with normal weapons, excluding bows.pyro-desc:Pyros are immune to fire, and take significantly less damage from lava.pyro-strong:Each level you earn greatly increases the potency of some of the improvementspyro-weak:And just in case you didn't figure it out, Pyros aren't strong against their own kind.juggernaut-desc:Juggernauts are thick and very tough. Will reduce all incoming damage by an amount.juggernaut-strong:Each level you earn reduces the damage you can takejuggernaut-weak:Juggernauts can only do up to 6 damage at a time unless using axesbeastmaster-desc:Beastmasters are the greatest beast tamers that exist. Not only can you tame most wolves and cats, you even get a loyal wolf that is loyal only to you.beastmaster-strong:Each level you earn increases your wolf's statsbeastmaster-weak:Beast masters aren't very strong without their pet.arbalist-desc:Arbalists are long ranged snipers, prefering secluded sniping spots. Their shots are lethal and swift, eliminating far-away targets with ease. Punching while using a bow fires an arrowarbalist-strong:Each level you earn allows you to (punch) shoot fasterarbalist-weak:Arbalists are weaker with any weapon other than bows.