Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 69bb6599d52db305ed76dcf9b54e3240564227b0b9298a7cd480ebb7dd0affe3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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