Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ce1f7dc2e7264c16164f46b3e38f4e1738d7c8511909a009cc0c99b56c7cee06:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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