Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b3ec29a592d05f1fa74c3e864f44084613e37eb95466aa15b3214c8aac766278:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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