Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d9d1bf0504ef8a4aab1120febab1ab1cd56265dcd16462de9ae85dd632eae1c2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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