Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c7a010aef52a9b54f6bdd5da1a22880508fda54624e896d9b92c881dc93ec165:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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