Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 84cf51e5442a85517ab713a4a125890be0a228a72881b8eeb0ac7718becf6b3f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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