Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a169571b7c4ce956357f020d2861eae325db2f51a8688d692f3c0d5e94d7779d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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