Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4783456753270f3132217dd07f307ea19ef64052b411470f7b2d7483d2753d36:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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