Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0af16e58937560b5e8e9e7c51b933ce5dfd7254d4ea59090477671e008f03f56:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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