Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 651cdba34a20bff92f8bca83361b83d3b8409bd52b81506aa89884b7b6b053f1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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