Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9beaefe94b686b9d2ad1b1831c84e47b7a5cff6872d47b8b61cf8f8802325dab:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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