Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bd767a2b6604f9f7cf728c9cf3342acaa5bca6aba4a2a90ec974a62b292265c3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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