Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4d92964ffca9ea027bb9d586d910ce4994cac25efa784aec82f94914f214be4e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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