Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fa1337e011db7a6ae46f4fa92c0bb8a026448efc77728324d82f293b43eb5461:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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