Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> cda999c493c4023a44a84fe9aee0554f7e37dd74d9753ddbb2c073e2cab67499:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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