Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 954150791f8df10cbd59e104a48d8bd9455eba97fd91b69b6838dbfcc6ccb04e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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