Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5ecc7997071882bdb8072b382dd0ad2f6e82f3cc66260aa8e0c99f146023a7c9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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