Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> eaf0c34f33ab913fc1899c307a725268822d7bdd043d10a3b90a296bbeafdc86:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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