Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5e233daf52ece71e5e09d30d2931b2597760e0c45f7c51a695666be839c93054:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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