Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 194dc07301c07b23255f604b46414b35a47657a27af1dc7ed59552afde165ca1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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