Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bc2e185839ca36b27d937bd7bc6518c435b921a7940ae5c7c3e45d6129cc636f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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