Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b72d937f82d3e67c9082426a616528727e3455570fe9f7ec760ea299fe9b843c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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