Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4100a885cf2dc776496a6fb7b38f97d20d62b98877c6e1fb3f1933fc50558bd5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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