Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 64dee824cd5c0a5d2217b822c0b3e8d6b306c4de1b57ebaf6e618b529f19f9bc:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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