Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b02d908f661d2f2356093d277cfbc65c1fc527f3781e0c4e939dfb54c2bf846e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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