Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4aac318da811192abdd8cbe15bc42620f725dd5c5c90284e4cc84f3213f136ee:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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