Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 616023c785645008f1eeb277c04b3344f568e23b1aa98003e972d6b650c39d4f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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