Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8cd0ecc403ebf2542b0b9b53b8b348ac20a498fa05eb16e770f3b07957ea2384:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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