Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 74e29e50e62574d1af76653cf4234c7904833088dcafde7678c1ec7bf9822391:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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