Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b76aa2f75e2508b56db689d54e208892ba17013b756f5d2f2a0600628e2a52cb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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