Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> cdbb0b7ef6b4031bcd60685a7e8159b054b3e850b79dbda2376cb9b36e47f3ae:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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