Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9c292a1ed153ac04908992197e35ca2a45c45d78310d007537fc4d9aa7eb54b6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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