Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d04bef54374e0beccca2cdaee15a8f0a2491f58f6fd7e049cccb7a6450af68c7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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