Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7d6898f6247b9cf26545f4f873657f0eb658cb57d0ad3ab57b84729635270247:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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