Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a760803d6aa4aa86cc9d4b4ec0859fa091a49088532b7aaf1277459819c27d36:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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