Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d572d507b9288c45270416ed97d38f619d91e84dde1ec4108c9e6204394d88a3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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