PriceType does not take item

[MarvinKlar]

I do have this shop:

  Heller_zu_Groschen:
    PriceType: item
    Price:
    - - type:EMERALD
      - 'name:&6Heller'
      - amount:1
    RewardType: command
    Reward:
    - moneyadm add %player% 16
    MenuItem:
    - 'name:&61 Heller tauschen'
    - amount:1
    - type:PAPER
    - hideflags:all
    - 'custommodel:gui/heller_zu_groschen'
    Message: ''
    ExtraPermission: ''
    InventoryLocation: 12

But it does not accept this Item:

Why?

[MarvinKlar]

I do get the error message NotEnough.Item