Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0bf15bfa6b9b26033363112c54b5543ca0d936f4af10c707abd42b4a81d8d2f4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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