Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 71452a3fbb7d12edf263fd181649e4fbc2a6529e284838a783538c30592e60a6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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