Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3438b17305b12d3dc63a9af60308616cb6e0360f6950ab9df4fac175881fb211:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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