Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 63a40d2afc1b46ece0dda390b3db3062baaead9fafa75db210f6724bfa2514bb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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