Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9cfdd09489db00cbfc8a411064b3db877aa935729dd798ec1bf97cda8e1c7c0e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16