Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9786216b184b5d83f290d1ebd8d823f49880e8d0b8f7b191d7e7736341979421:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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