I need help with my dupe skript

[asssaerfsaf]

Hey so, i need to make a dupe skript but it shows 2 errors. Heres my skript and the error. command /dupe:
  trigger:
    set {_tool} to player's tool
    if {_tool} is air:
      send "&aYou cannot dupe air!" to player
      stop
    else:
      if "%{_tool}%" contains "shulker box":
        set {_tag} to tag "tag;BlockEntityTag;Items" of nbt compound of {_tool} 
        if "%{_tag}%" contains "elytra" or "dragon egg" or "dragon head" or "smithing template" or "netherite ingot":
          send "&aThis item is blacklisted." to player
          stop
      else if
      {_tool} is a elytra or dragon egg or dragon head or smithing template or netherite ingot:
      send "&aThis item is blacklisted." to player
      stop
    give player's tool to player

[eeeefafgava]

did you add skbee plugin?

 

[3TSV]

You do not have SKBee Installed.