Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c7202a25e280011ce242fe68ddd50ebe239fbafde44c11aa1d44967bedf86d76:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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