Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2cf7b35253800f0234fc93689c572c9f3068dbd903ed95cc9474efc317ce54b8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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