Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c0c41d947321fcbaed1d548c0e430e293490355861b96fff8fc914d2cf9948cb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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