Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 57ed8a17666c5f1c2cfe806ef24005f9da2dfdae7f0708f30e3e3714c2ff6d21:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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