Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9c6fa0c57931f97d2ba971aea730a1250f1e2ae513a590340f1b108e3423d566:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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