Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 16a8a8909b85dad421191e73270dc24b8588fa47f9ab7b90a30d06373a0aae13:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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