Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bc0ceb6703e0494a17870975c69a475bfba7da3f1078ecd5a49659242df238a3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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