Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 25d903bf68a8d2bdd102d980071372a5a5354adaf0670830647d1fb7bad82d30:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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