Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> df8a746ea0e0a3901a38557d71d30c62fe5518c05d2297da163d3c7d3225e59b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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