Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b40e751d9abbc0afd18a470b3a90bbcb924a427b833c047227085c76c1fbbc70:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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