Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a1623de3b9d2d1b110f73f0cb7cf7b73b7a569b8f63a444c79d103def3a3fab6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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