Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bfa716f8b80a6dc3f3f1c4fef4d4cad48e7535d78309336b25bfb08b0b571525:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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