Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 53ee2ec58ad60e667dc1f146d70abf5cb9f26355999ec4c60b2fd828f1307c2b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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