Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d7d3e288c3c4077844ab1820b0ed9d4b50631135bda01deaf2e725e9c9dd0891:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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