Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f07de18aa06e97b29fc3b91d83120d589599939aa90b31a5b0e7664965ec612f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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