Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f3ab7c8d05f8fb6bbd3593a923a1b254bc24acf63e4142e2d04fc001ec8c5245:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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