Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ca1fe5c39ad0629d9985e7b59aabc05bddc73df4d42edc92c33ecb2cb7ba3534:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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