ChestShop - Help needed!

Hello people

I got my ChestShop plugin all set up and it's working like a charm. Except for one thing. I've set up a few testing shops on my name. However when another player clicks the sign above them chests, nothing happens, they buy nothing. While when I click the sign above the chest, it opens the chest (so this tells me the signs are linked to the chests).

Anyone knows what might be causing this?

Thanks in advance.

 

permissions

 

Here's my permission file.
What permissions exactly you say I'm missing?

Code:

groups:
  Everyone:
    default: true
    info:
      prefix: '&f'
      suffix: ''
      build: true
    permissions:
      - 'essentials.kit'
      - 'essentials.pay'
      - 'essentials.afk'
      - 'essentials.help'
      - 'essentials.ignore'
      - 'essentials.info'
      - 'essentials.list'
      - 'essentials.mail.*'
      - 'essentials.me'
      - 'essentials.motd'
      - 'essentials.msg'
      - 'essentials.rules'
      - 'essentials.seen'
      - 'essentials.suicide'
      - 'essentials.tpaccept'
      - 'essentials.tpdeny'
      - 'essentials.balancetop'
      - 'essentials.spawn'
      - 'essentials.balance'
      - 'iConomy.holdings'
      - 'iConomy.help'
      - 'iConomy.payment'
      - 'reportrts.command.modreq'
      - 'reportrts.command.check.self'
      - 'reportrts.command.modlist'
      - 'reportrts.command.help'
      - 'citizens.help'
      - 'multiverse.core.list.who'
      - 'towny.town.*'
      - 'towny.nation.*'
      - 'towny.claimed.owntown.build.*'
      - 'towny.wild.*'
      - 'towny.chat.general'
      - 'towny.chat.town'
      - 'towny.chat.nation'
      - 'towny.chat.local'
      - 'multiverse.portal.acces.survival_world'
      - 'multiverse.portal.acces.creative_world'
      - 'ChestShop.shop.create'
      - 'ChestShop.shop.buy'
  ServerOwner:
    default: false
    info:
      prefix: '&5'
      suffix: ''
      build: true
    inheritance:
      - 'Administrators'
    permissions:
      - 'essentials.deljail'
      - 'essentials.setjail'
      - 'essentials.backup'
      - 'reportrts.command.stats'
      - 'essentials.gamemode.others'
      - 'essentials.give'
      - 'multiverse.core.spawn.set'
  Moderators:
    default: false
    info:
      prefix: '&1'
      suffix: ''
      build: true
    inheritance:
      - 'Everyone'
    permissions:
      - 'essentials.gamemode'
      - 'essentials.hat'
      - 'essentials.speed'
      - 'essentials.broadcast'
      - 'essentials.invsee'
      - 'essentials.invsee.modify'
      - 'essentials.jails'
      - 'essentials.killall'
      - 'essentials.remove'
      - 'essentials.socialspy'
      - 'essentials.back.*'
      - 'essentials.tp'
      - 'essentials.tpahere'
      - 'essentials.tppos'
      - 'vanish.adminalerts'
      - 'vanish.hooks.dynmap'
      - 'vanish.list'
      - 'vanish.nofollow'
      - 'vanish.nohunger'
      - 'vanish.nointeract'
      - 'vanish.nopickup'
      - 'vanish.notrample'
      - 'vanish.permtest.all'
      - 'vanish.preventdamage.*'
      - 'vanish.see'
      - 'vanish.silentchests'
      - 'vanish.silentjoin'
      - 'vanish.vanish'
      - 'essentials.list.hidden'
      - 'essentials.chat.ignoreexempt'
      - 'essentials.seen.banreason'
      - 'essentials.balance.others'
      - 'essentials.afk.kickexempt'
      - 'essentials.getpos.others'
      - 'essentials.ban.notify'
      - 'essentials.tempban.exempt'
      - 'essentials.ban.exempt'
      - 'essentials.kick.*'
      - 'iConomy.holdings.*'
      - 'essentials.togglejail.offline'
      - 'essentials.jail.exempt'
      - 'lwc.mod'
      - 'vanish.preventdamage'
      - 'towny.chat.spy'
      - 'towny.chat.admin'
      - 'essentials.kick'
      - 'essentials.mute'
      - 'essentials.mute.exempt'
      - 'essentials.sudo'
      - 'announcer.moderate'
      - 'announcer.admin'
      - 'essentials.speed.bypass'
      - 'essentials.remove.*'
      - 'reportrts.command.broadcast'
      - 'reportrts.command.check'
      - 'reportrts.command.claim'
      - 'reportrts.command.complete'
      - 'reportrts.command.hold'
      - 'reportrts.command.teleport'
      - 'essentials.togglejail'
      - 'essentials.enderchest.*'
      - 'multiverse.teleport.self.*'
      - 'ChestShop.mod'
      - 'ChestShop.name.*'
  Administrators:
    default: false
    info:
      prefix: '&4'
      suffix: ''
      build: true
    inheritance:
      - 'Moderators'
    permissions:
      - 'dynmap.*'
      - 'vanish.reload'
      - 'essentials.eco'
      - 'essentials.seen.extra'
      - 'essentials.banip'
      - 'essentials.essentials'
      - 'essentials.tempban.*'
      - 'essentials.unban'
      - 'essentials.unbanip'
      - 'essentials.tpaall'
      - 'iConomy.accounts.give'
      - 'iConomy.accounts.take'
      - 'reportrts.command.ban'
      - 'treasurechest.*'
      - 'citizens.*'
      - 'worldedit.clipboard.copy'
      - 'worldedit.clipboard.rotate'
      - 'worldedit.clipboard.flip'
      - 'worldedit.clipboard.cut'
      - 'worldedit.clipboard.paste'
      - 'worldedit.generation.cylinder'
      - 'worldedit.generation.sphere'
      - 'worldedit.generation.forest'
      - 'worldedit.generation.pumpkins'
      - 'worldedit.generation.pyramid'
      - 'worldedit.generation.shape'
      - 'worldedit.history.redo'
      - 'worldedit.history.undo'
      - 'worldedit.region.walls'
      - 'worldedit.region.faces'
      - 'worldedit.region.set'
      - 'worldedit.region.move'
      - 'worldedit.selection.pos'
      - 'worldedit.wand'
      - 'worldedit.selection.hpos'
      - 'worldedit.selection.expand'
      - 'worldedit.tool.replacer'
      - 'worldedit.fixwater'
      - 'worldedit.fill'
      - 'essentials.ban'
      - 'essentials.ban.offline'
      - 'essentials.clearinventory'
      - 'lwc.admin'
      - 'rs.admin'
      - 'residence.create'
      - 'residence.admin'
      - 'citizens.admin.*'