Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9b33cf51fb1fecd990a50733d6584718f86f52161e41ee648325d9aa90521cf8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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