Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d501896f8c919fd04af907b1ce117f2a77481c7b9d97842749d04120b33b801c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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