Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5a809134d8b7c8ed9a681431a65d1271839e19dc5ad2b4c1d60b558d63d8f88e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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