Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2b9424393c3927d066b10c6a45d7b4492fb5818ddc023d87a0a4be3dc1ff4b8f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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