Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0468c104fb751c73077db3b5d5e03c0ddf5b53b8bc5408ea8b64f067e54efb99:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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