Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8460c8c6ab04e9f372d628ff7233f82ffc5944df901d8c1a5fe6d74bf7ef7b80:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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