Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 17938db49d35de89aa73d116dfe03091b0e3a1fc064936b3bf0abbd8f1f905b2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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