Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 62ebe393375793e0914bd6a4dcd2e3fbe6594fd9da3e94dd73deab0abc794891:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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