Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2d6b5079db2fad97d54cdbc15f0a216cde8bbc446660aa5e94fa8e00d9fe0a26:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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