Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f90a27e966567218141b39c533932b63c602d41d78f40e9766dd13616ab26873:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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