Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5dbf9e1964e335851d96040e6bed23e53958247931f1ffe4e5bc4753815e7a58:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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