Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5fbd84038b64a85db2c464d007d101547509fdc6d4b81b5ff719ef177f14d002:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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