Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 657a40d397ee0bc5816e5bf54e81ad47f9a660d74b7986934498d132f4bef889:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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