Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c7472418cafe8e94dd99456b7fc128ef7f5d4ff473c03f8e3b9ffb9dbb92fac4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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