Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8ff24928ef82997e9b5c503167393907855d48c8ddf6c471778e0b58505117f7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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