Question Why isn't iDisguise working? (An internal error occured trying to perform this command.)

So I've been using iDisguise recently, but it just won't work properly. Can someone help me.

Code:

language.yml
reload-complete: §6[iDisguise] Reload complete.
no-permission: §cYou are not allowed to do this.
console-use-other-command: §cUse /odisguise from the server console.
cannot-find-player: §cCannot find player %player%.
wrong-usage-no-name: '§cWrong usage: account name required'
wrong-usage-two-disguise-types: '§cWrong usage: two disguise types given'
wrong-usage-unknown-arguments: '§cWrong usage: unknown arguments §o%arguments%'
invalid-name: §cThe given account name is invalid.
event-cancelled: §cAnother plugin prohibits you to do that.
disguise-player-success-self: §6You disguised as a %type% called %name%.
disguise-player-success-other: §6%player% disguised as a %type% called %name%.
disguise-success-self: §6You disguised as a %type%.
disguise-success-other: §6%player% disguised as a %type%.
status-player-self: §6You are disguised as a %type% called %name%.
status-player-other: §6%player% is disguised as a %type% called %name%.
status-self: §6You are disguised as a %type%.
status-other: §6%player% is disguised as a %type%.
status-subtypes: §7(%subtypes%)
status-not-disguised-self: §6You are not disguised.
status-not-disguised-other: §6%player% is not disguised.
outdated-server: §cYour Minecraft version does not support the given disguise type.
undisguise-console: §cYou are not a player so you cannot undisguise.
undisguise-not-disguised-self: §cYou are not disguised.
undisguise-not-disguised-other: §c%player% is not disguised.
undisguise-success-self: §6You undisguised.
undisguise-success-other: §6%player% undisguised.
undisguise-success-all: §6%share% out of %total% disguised players undisguised.
undisguise-success-all-ignore: §6Undisguised every disguised player ignoring other plugins.
help-info: §a%name% %version% - Help
help-base: §6§o %command% §6- %description%
help-types: '§7Types: %types%'
help-types-available: '%type%'
help-types-not-supported: §m%type%
help-types-no-permission: §m%type%
help-help: Shows this message
help-player-self: Disguise yourself as a player
help-player-other: Disguise a player as a player
help-random-self: Disguise yourself as a randomly chosen mob
help-random-other: Disguise a player as a randomly chosen mob
help-reload: Reload config and language file
help-status-self: Shows your disguise status
help-status-other: Shows a player's disguise status
help-undisguise-self: Undisguise yourself
help-undisguise-all: Undisguise everyone
help-undisguise-other: Undisguise a player
help-disguise-self: Disguise yourself as a mob with optional subtypes
help-disguise-other: Disguise a player as a mob with optional subtypes
help-subtype: Apply one (or multiple) subtypes
join-disguised: §6You are still disguised. Use §o/disguise status§r§6 to get more information.
move-as-shulker: §cYou must not move while you are disguised as a shulker.
update-available: '§6[iDisguise] An update is available: %version%'
update-already-downloaded: §6[iDisguise] Update already downloaded. (Restart server to apply update)
update-downloading: §6[iDisguise] Downloading update...
update-download-succeeded: §6[iDisguise] Download succeeded. (Restart server to apply update)
update-download-failed: §c[iDisguise] Download failed.
update-option: §6[iDisguise] You can enable automatic updates in the config file.
easter-egg-birthday: §eYAAAY!!! Today is my birthday! I'm %age% years old now.

 

https://pastebin.com/raw/cdYhi4Pe