Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9da131a60f829a011a05f8ab3eda940c37b8de3ecee26766696963af8627713d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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