Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> aaa05d3916b9d67f58f33d800cda8c8fcc0c70e3db07fcad4d31ed9e3f4b4457:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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